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See Release Notes

  • Bug fixes for general core bugs in 3.11.x will end 14 Nov 2022 (12 months plus 6 months extension).
  • Bug fixes for security issues in 3.11.x will end 13 Nov 2023 (18 months plus 12 months extension).
  • PHP version: minimum PHP 7.3.0 Note: minimum PHP version has increased since Moodle 3.10. PHP 7.4.x is supported too.
/lib/ -> pagelib.php (source)

Differences Between: [Versions 310 and 311] [Versions 311 and 400] [Versions 311 and 401] [Versions 311 and 402] [Versions 311 and 403] [Versions 39 and 311]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * This file contains the moodle_page class. There is normally a single instance
  19   * of this class in the $PAGE global variable. This class is a central repository
  20   * of information about the page we are building up to send back to the user.
  21   *
  22   * @package core
  23   * @category page
  24   * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
  25   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26   */
  27  
  28  defined('MOODLE_INTERNAL') || die();
  29  
  30  /**
  31   * $PAGE is a central store of information about the current page we are
  32   * generating in response to the user's request.
  33   *
  34   * It does not do very much itself
  35   * except keep track of information, however, it serves as the access point to
  36   * some more significant components like $PAGE->theme, $PAGE->requires,
  37   * $PAGE->blocks, etc.
  38   *
  39   * @copyright 2009 Tim Hunt
  40   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  41   * @since Moodle 2.0
  42   * @package core
  43   * @category page
  44   *
  45   * The following properties are alphabetical. Please keep it that way so that its
  46   * easy to maintain.
  47   *
  48   * @property-read string $activityname The type of activity we are in, for example 'forum' or 'quiz'.
  49   *      Will be null if this page is not within a module.
  50   * @property-read stdClass $activityrecord The row from the activities own database table (for example
  51   *      the forum or quiz table) that this page belongs to. Will be null
  52   *      if this page is not within a module.
  53   * @property-read array $alternativeversions Mime type => object with ->url and ->title.
  54   * @property-read block_manager $blocks The blocks manager object for this page.
  55   * @property-read array $blockmanipulations
  56   * @property-read string $bodyclasses A string to use within the class attribute on the body tag.
  57   * @property-read string $bodyid A string to use as the id of the body tag.
  58   * @property-read string $button The HTML to go where the Turn editing on button normally goes.
  59   * @property-read bool $cacheable Defaults to true. Set to false to stop the page being cached at all.
  60   * @property-read array $categories An array of all the categories the page course belongs to,
  61   *      starting with the immediately containing category, and working out to
  62   *      the top-level category. This may be the empty array if we are in the
  63   *      front page course.
  64   * @property-read mixed $category The category that the page course belongs to.
  65   * @property-read cm_info $cm The course_module that this page belongs to. Will be null
  66   *      if this page is not within a module. This is a full cm object, as loaded
  67   *      by get_coursemodule_from_id or get_coursemodule_from_instance,
  68   *      so the extra modname and name fields are present.
  69   * @property-read context $context The main context to which this page belongs.
  70   * @property-read stdClass $course The current course that we are inside - a row from the
  71   *      course table. (Also available as $COURSE global.) If we are not inside
  72   *      an actual course, this will be the site course.
  73   * @property-read string $devicetypeinuse The name of the device type in use
  74   * @property-read string $docspath The path to the Moodle docs for this page.
  75   * @property-read string $focuscontrol The id of the HTML element to be focused when the page has loaded.
  76   * @property-read bool $headerprinted True if the page header has already been printed.
  77   * @property-read string $heading The main heading that should be displayed at the top of the <body>.
  78   * @property-read string $headingmenu The menu (or actions) to display in the heading
  79   * @property-read array $layout_options An arrays with options for the layout file.
  80   * @property-read array $legacythemeinuse True if the legacy browser theme is in use.
  81   * @property-read navbar $navbar The navbar object used to display the navbar
  82   * @property-read global_navigation $navigation The navigation structure for this page.
  83   * @property-read xhtml_container_stack $opencontainers Tracks XHTML tags on this page that have been opened but not closed.
  84   *      mainly for internal use by the rendering code.
  85   * @property-read string $pagelayout The general type of page this is. For example 'normal', 'popup', 'home'.
  86   *      Allows the theme to display things differently, if it wishes to.
  87   * @property-read string $pagetype The page type string, should be used as the id for the body tag in the theme.
  88   * @property-read int $periodicrefreshdelay The periodic refresh delay to use with meta refresh
  89   * @property-read page_requirements_manager $requires Tracks the JavaScript, CSS files, etc. required by this page.
  90   * @property-read string $requestip The IP address of the current request, null if unknown.
  91   * @property-read string $requestorigin The type of request 'web', 'ws', 'cli', 'restore', etc.
  92   * @property-read settings_navigation $settingsnav The settings navigation
  93   * @property-read int $state One of the STATE_... constants
  94   * @property-read string $subpage The subpage identifier, if any.
  95   * @property-read theme_config $theme The theme for this page.
  96   * @property-read string $title The title that should go in the <head> section of the HTML of this page.
  97   * @property-read moodle_url $url The moodle url object for this page.
  98   */
  99  class moodle_page {
 100  
 101      /** The state of the page before it has printed the header **/
 102      const STATE_BEFORE_HEADER = 0;
 103  
 104      /** The state the page is in temporarily while the header is being printed **/
 105      const STATE_PRINTING_HEADER = 1;
 106  
 107      /** The state the page is in while content is presumably being printed **/
 108      const STATE_IN_BODY = 2;
 109  
 110      /**
 111       * The state the page is when the footer has been printed and its function is
 112       * complete.
 113       */
 114      const STATE_DONE = 3;
 115  
 116      /**
 117       * @var int The current state of the page. The state a page is within
 118       * determines what actions are possible for it.
 119       */
 120      protected $_state = self::STATE_BEFORE_HEADER;
 121  
 122      /**
 123       * @var stdClass The course currently associated with this page.
 124       * If not has been provided the front page course is used.
 125       */
 126      protected $_course = null;
 127  
 128      /**
 129       * @var cm_info If this page belongs to a module, this is the cm_info module
 130       * description object.
 131       */
 132      protected $_cm = null;
 133  
 134      /**
 135       * @var stdClass If $_cm is not null, then this will hold the corresponding
 136       * row from the modname table. For example, if $_cm->modname is 'quiz', this
 137       * will be a row from the quiz table.
 138       */
 139      protected $_module = null;
 140  
 141      /**
 142       * @var context The context that this page belongs to.
 143       */
 144      protected $_context = null;
 145  
 146      /**
 147       * @var array This holds any categories that $_course belongs to, starting with the
 148       * particular category it belongs to, and working out through any parent
 149       * categories to the top level. These are loaded progressively, if needed.
 150       * There are three states. $_categories = null initially when nothing is
 151       * loaded; $_categories = array($id => $cat, $parentid => null) when we have
 152       * loaded $_course->category, but not any parents; and a complete array once
 153       * everything is loaded.
 154       */
 155      protected $_categories = null;
 156  
 157      /**
 158       * @var array An array of CSS classes that should be added to the body tag in HTML.
 159       */
 160      protected $_bodyclasses = array();
 161  
 162      /**
 163       * @var string The title for the page. Used within the title tag in the HTML head.
 164       */
 165      protected $_title = '';
 166  
 167      /**
 168       * @var string The string to use as the heading of the page. Shown near the top of the
 169       * page within most themes.
 170       */
 171      protected $_heading = '';
 172  
 173      /**
 174       * @var string The pagetype is used to describe the page and defaults to a representation
 175       * of the physical path to the page e.g. my-index, mod-quiz-attempt
 176       */
 177      protected $_pagetype = null;
 178  
 179      /**
 180       * @var string The pagelayout to use when displaying this page. The
 181       * pagelayout needs to have been defined by the theme in use, or one of its
 182       * parents. By default base is used however standard is the more common layout.
 183       * Note that this gets automatically set by core during operations like
 184       * require_login.
 185       */
 186      protected $_pagelayout = 'base';
 187  
 188      /**
 189       * @var array List of theme layout options, these are ignored by core.
 190       * To be used in individual theme layout files only.
 191       */
 192      protected $_layout_options = null;
 193  
 194      /**
 195       * @var string An optional arbitrary parameter that can be set on pages where the context
 196       * and pagetype is not enough to identify the page.
 197       */
 198      protected $_subpage = '';
 199  
 200      /**
 201       * @var string Set a different path to use for the 'Moodle docs for this page' link.
 202       * By default, it uses the path of the file for instance mod/quiz/attempt.
 203       */
 204      protected $_docspath = null;
 205  
 206      /**
 207       * @var string A legacy class that will be added to the body tag
 208       */
 209      protected $_legacyclass = null;
 210  
 211      /**
 212       * @var moodle_url The URL for this page. This is mandatory and must be set
 213       * before output is started.
 214       */
 215      protected $_url = null;
 216  
 217      /**
 218       * @var array An array of links to alternative versions of this page.
 219       * Primarily used for RSS versions of the current page.
 220       */
 221      protected $_alternateversions = array();
 222  
 223      /**
 224       * @var block_manager The blocks manager for this page. It is responsible for
 225       * the blocks and there content on this page.
 226       */
 227      protected $_blocks = null;
 228  
 229      /**
 230       * @var page_requirements_manager Page requirements manager. It is responsible
 231       * for all JavaScript and CSS resources required by this page.
 232       */
 233      protected $_requires = null;
 234  
 235      /** @var page_requirements_manager Saves the requirement manager object used before switching to to fragments one. */
 236      protected $savedrequires = null;
 237  
 238      /**
 239       * @var string The capability required by the user in order to edit blocks
 240       * and block settings on this page.
 241       */
 242      protected $_blockseditingcap = 'moodle/site:manageblocks';
 243  
 244      /**
 245       * @var bool An internal flag to record when block actions have been processed.
 246       * Remember block actions occur on the current URL and it is important that
 247       * even they are never executed more than once.
 248       */
 249      protected $_block_actions_done = false;
 250  
 251      /**
 252       * @var array An array of any other capabilities the current user must have
 253       * in order to editing the page and/or its content (not just blocks).
 254       */
 255      protected $_othereditingcaps = array();
 256  
 257      /**
 258       * @var bool Sets whether this page should be cached by the browser or not.
 259       * If it is set to true (default) the page is served with caching headers.
 260       */
 261      protected $_cacheable = true;
 262  
 263      /**
 264       * @var string Can be set to the ID of an element on the page, if done that
 265       * element receives focus when the page loads.
 266       */
 267      protected $_focuscontrol = '';
 268  
 269      /**
 270       * @var string HTML to go where the turn on editing button is located. This
 271       * is nearly a legacy item and not used very often any more.
 272       */
 273      protected $_button = '';
 274  
 275      /**
 276       * @var theme_config The theme to use with this page. This has to be properly
 277       * initialised via {@link moodle_page::initialise_theme_and_output()} which
 278       * happens magically before any operation that requires it.
 279       */
 280      protected $_theme = null;
 281  
 282      /**
 283       * @var global_navigation Contains the global navigation structure.
 284       */
 285      protected $_navigation = null;
 286  
 287      /**
 288       * @var settings_navigation Contains the settings navigation structure.
 289       */
 290      protected $_settingsnav = null;
 291  
 292      /**
 293       * @var flat_navigation Contains a list of nav nodes, most closely related to the current page.
 294       */
 295      protected $_flatnav = null;
 296  
 297      /**
 298       * @var navbar Contains the navbar structure.
 299       */
 300      protected $_navbar = null;
 301  
 302      /**
 303       * @var string The menu (or actions) to display in the heading.
 304       */
 305      protected $_headingmenu = null;
 306  
 307      /**
 308       * @var array stack trace. Then the theme is initialised, we save the stack
 309       * trace, for use in error messages.
 310       */
 311      protected $_wherethemewasinitialised = null;
 312  
 313      /**
 314       * @var xhtml_container_stack Tracks XHTML tags on this page that have been
 315       * opened but not closed.
 316       */
 317      protected $_opencontainers;
 318  
 319      /**
 320       * @var int Sets the page to refresh after a given delay (in seconds) using
 321       * meta refresh in {@link standard_head_html()} in outputlib.php
 322       * If set to null(default) the page is not refreshed
 323       */
 324      protected $_periodicrefreshdelay = null;
 325  
 326      /**
 327       * @var array Associative array of browser shortnames (as used by check_browser_version)
 328       * and their minimum required versions
 329       */
 330      protected $_legacybrowsers = array('MSIE' => 6.0);
 331  
 332      /**
 333       * @var string Is set to the name of the device type in use.
 334       * This will we worked out when it is first used.
 335       */
 336      protected $_devicetypeinuse = null;
 337  
 338      /**
 339       * @var bool Used to determine if HTTPS should be required for login.
 340       */
 341      protected $_https_login_required = false;
 342  
 343      /**
 344       * @var bool Determines if popup notifications allowed on this page.
 345       * Code such as the quiz module disables popup notifications in situations
 346       * such as upgrading or completing a quiz.
 347       */
 348      protected $_popup_notification_allowed = true;
 349  
 350      /**
 351       * @var bool Is the settings menu being forced to display on this page (activities / resources only).
 352       * This is only used by themes that use the settings menu.
 353       */
 354      protected $_forcesettingsmenu = false;
 355  
 356      /**
 357       * @var array Array of header actions HTML to add to the page header actions menu.
 358       */
 359      protected $_headeractions = [];
 360  
 361      /**
 362       * @var bool Should the region main settings menu be rendered in the header.
 363       */
 364      protected $_regionmainsettingsinheader = false;
 365  
 366      /**
 367       * Force the settings menu to be displayed on this page. This will only force the
 368       * settings menu on an activity / resource page that is being displayed on a theme that
 369       * uses a settings menu.
 370       *
 371       * @param bool $forced default of true, can be sent false to turn off the force.
 372       */
 373      public function force_settings_menu($forced = true) {
 374          $this->_forcesettingsmenu = $forced;
 375      }
 376  
 377      /**
 378       * Check to see if the settings menu is forced to display on this activity / resource page.
 379       * This only applies to themes that use the settings menu.
 380       *
 381       * @return bool True if the settings menu is forced to display.
 382       */
 383      public function is_settings_menu_forced() {
 384          return $this->_forcesettingsmenu;
 385      }
 386  
 387      // Magic getter methods =============================================================
 388      // Due to the __get magic below, you normally do not call these as $PAGE->magic_get_x
 389      // methods, but instead use the $PAGE->x syntax.
 390  
 391      /**
 392       * Please do not call this method directly, use the ->state syntax. {@link moodle_page::__get()}.
 393       * @return integer one of the STATE_XXX constants. You should not normally need
 394       * to use this in your code. It is intended for internal use by this class
 395       * and its friends like print_header, to check that everything is working as
 396       * expected. Also accessible as $PAGE->state.
 397       */
 398      protected function magic_get_state() {
 399          return $this->_state;
 400      }
 401  
 402      /**
 403       * Please do not call this method directly, use the ->headerprinted syntax. {@link moodle_page::__get()}.
 404       * @return bool has the header already been printed?
 405       */
 406      protected function magic_get_headerprinted() {
 407          return $this->_state >= self::STATE_IN_BODY;
 408      }
 409  
 410      /**
 411       * Please do not call this method directly, use the ->course syntax. {@link moodle_page::__get()}.
 412       * @return stdClass the current course that we are inside - a row from the
 413       * course table. (Also available as $COURSE global.) If we are not inside
 414       * an actual course, this will be the site course.
 415       */
 416      protected function magic_get_course() {
 417          global $SITE;
 418          if (is_null($this->_course)) {
 419              return $SITE;
 420          }
 421          return $this->_course;
 422      }
 423  
 424      /**
 425       * Please do not call this method directly, use the ->cm syntax. {@link moodle_page::__get()}.
 426       * @return cm_info the course_module that this page belongs to. Will be null
 427       * if this page is not within a module. This is a full cm object, as loaded
 428       * by get_coursemodule_from_id or get_coursemodule_from_instance,
 429       * so the extra modname and name fields are present.
 430       */
 431      protected function magic_get_cm() {
 432          return $this->_cm;
 433      }
 434  
 435      /**
 436       * Please do not call this method directly, use the ->activityrecord syntax. {@link moodle_page::__get()}.
 437       * @return stdClass the row from the activities own database table (for example
 438       * the forum or quiz table) that this page belongs to. Will be null
 439       * if this page is not within a module.
 440       */
 441      protected function magic_get_activityrecord() {
 442          if (is_null($this->_module) && !is_null($this->_cm)) {
 443              $this->load_activity_record();
 444          }
 445          return $this->_module;
 446      }
 447  
 448      /**
 449       * Please do not call this method directly, use the ->activityname syntax. {@link moodle_page::__get()}.
 450       * @return string the The type of activity we are in, for example 'forum' or 'quiz'.
 451       * Will be null if this page is not within a module.
 452       */
 453      protected function magic_get_activityname() {
 454          if (is_null($this->_cm)) {
 455              return null;
 456          }
 457          return $this->_cm->modname;
 458      }
 459  
 460      /**
 461       * Please do not call this method directly, use the ->category syntax. {@link moodle_page::__get()}.
 462       * @return stdClass the category that the page course belongs to. If there isn't one
 463       * (that is, if this is the front page course) returns null.
 464       */
 465      protected function magic_get_category() {
 466          $this->ensure_category_loaded();
 467          if (!empty($this->_categories)) {
 468              return reset($this->_categories);
 469          } else {
 470              return null;
 471          }
 472      }
 473  
 474      /**
 475       * Please do not call this method directly, use the ->categories syntax. {@link moodle_page::__get()}.
 476       * @return array an array of all the categories the page course belongs to,
 477       * starting with the immediately containing category, and working out to
 478       * the top-level category. This may be the empty array if we are in the
 479       * front page course.
 480       */
 481      protected function magic_get_categories() {
 482          $this->ensure_categories_loaded();
 483          return $this->_categories;
 484      }
 485  
 486      /**
 487       * Please do not call this method directly, use the ->context syntax. {@link moodle_page::__get()}.
 488       * @return context the main context to which this page belongs.
 489       */
 490      protected function magic_get_context() {
 491          global $CFG;
 492          if (is_null($this->_context)) {
 493              if (CLI_SCRIPT or NO_MOODLE_COOKIES) {
 494                  // Cli scripts work in system context, do not annoy devs with debug info.
 495                  // Very few scripts do not use cookies, we can safely use system as default context there.
 496              } else if (AJAX_SCRIPT && $CFG->debugdeveloper) {
 497                  // Throw exception inside AJAX script in developer mode, otherwise the debugging message may be missed.
 498                  throw new coding_exception('$PAGE->context was not set. You may have forgotten '
 499                      .'to call require_login() or $PAGE->set_context()');
 500              } else {
 501                  debugging('Coding problem: $PAGE->context was not set. You may have forgotten '
 502                      .'to call require_login() or $PAGE->set_context(). The page may not display '
 503                      .'correctly as a result');
 504              }
 505              $this->_context = context_system::instance();
 506          }
 507          return $this->_context;
 508      }
 509  
 510      /**
 511       * Please do not call this method directly, use the ->pagetype syntax. {@link moodle_page::__get()}.
 512       * @return string e.g. 'my-index' or 'mod-quiz-attempt'.
 513       */
 514      protected function magic_get_pagetype() {
 515          global $CFG;
 516          if (is_null($this->_pagetype) || isset($CFG->pagepath)) {
 517              $this->initialise_default_pagetype();
 518          }
 519          return $this->_pagetype;
 520      }
 521  
 522      /**
 523       * Please do not call this method directly, use the ->pagetype syntax. {@link moodle_page::__get()}.
 524       * @return string The id to use on the body tag, uses {@link magic_get_pagetype()}.
 525       */
 526      protected function magic_get_bodyid() {
 527          return 'page-'.$this->pagetype;
 528      }
 529  
 530      /**
 531       * Please do not call this method directly, use the ->pagelayout syntax. {@link moodle_page::__get()}.
 532       * @return string the general type of page this is. For example 'standard', 'popup', 'home'.
 533       *      Allows the theme to display things differently, if it wishes to.
 534       */
 535      protected function magic_get_pagelayout() {
 536          return $this->_pagelayout;
 537      }
 538  
 539      /**
 540       * Please do not call this method directly, use the ->layout_options syntax. {@link moodle_page::__get()}.
 541       * @return array returns arrays with options for layout file
 542       */
 543      protected function magic_get_layout_options() {
 544          if (!is_array($this->_layout_options)) {
 545              $this->_layout_options = $this->_theme->pagelayout_options($this->pagelayout);
 546          }
 547          return $this->_layout_options;
 548      }
 549  
 550      /**
 551       * Please do not call this method directly, use the ->subpage syntax. {@link moodle_page::__get()}.
 552       * @return string The subpage identifier, if any.
 553       */
 554      protected function magic_get_subpage() {
 555          return $this->_subpage;
 556      }
 557  
 558      /**
 559       * Please do not call this method directly, use the ->bodyclasses syntax. {@link moodle_page::__get()}.
 560       * @return string the class names to put on the body element in the HTML.
 561       */
 562      protected function magic_get_bodyclasses() {
 563          return implode(' ', array_keys($this->_bodyclasses));
 564      }
 565  
 566      /**
 567       * Please do not call this method directly, use the ->title syntax. {@link moodle_page::__get()}.
 568       * @return string the title that should go in the <head> section of the HTML of this page.
 569       */
 570      protected function magic_get_title() {
 571          return $this->_title;
 572      }
 573  
 574      /**
 575       * Please do not call this method directly, use the ->heading syntax. {@link moodle_page::__get()}.
 576       * @return string the main heading that should be displayed at the top of the <body>.
 577       */
 578      protected function magic_get_heading() {
 579          return $this->_heading;
 580      }
 581  
 582      /**
 583       * Please do not call this method directly, use the ->heading syntax. {@link moodle_page::__get()}.
 584       * @return string The menu (or actions) to display in the heading
 585       */
 586      protected function magic_get_headingmenu() {
 587          return $this->_headingmenu;
 588      }
 589  
 590      /**
 591       * Please do not call this method directly, use the ->docspath syntax. {@link moodle_page::__get()}.
 592       * @return string the path to the Moodle docs for this page.
 593       */
 594      protected function magic_get_docspath() {
 595          if (is_string($this->_docspath)) {
 596              return $this->_docspath;
 597          } else {
 598              return str_replace('-', '/', $this->pagetype);
 599          }
 600      }
 601  
 602      /**
 603       * Please do not call this method directly, use the ->url syntax. {@link moodle_page::__get()}.
 604       * @return moodle_url the clean URL required to load the current page. (You
 605       * should normally use this in preference to $ME or $FULLME.)
 606       */
 607      protected function magic_get_url() {
 608          global $FULLME;
 609          if (is_null($this->_url)) {
 610              debugging('This page did not call $PAGE->set_url(...). Using '.s($FULLME), DEBUG_DEVELOPER);
 611              $this->_url = new moodle_url($FULLME);
 612              // Make sure the guessed URL cannot lead to dangerous redirects.
 613              $this->_url->remove_params('sesskey');
 614          }
 615          return new moodle_url($this->_url); // Return a clone for safety.
 616      }
 617  
 618      /**
 619       * The list of alternate versions of this page.
 620       * @return array mime type => object with ->url and ->title.
 621       */
 622      protected function magic_get_alternateversions() {
 623          return $this->_alternateversions;
 624      }
 625  
 626      /**
 627       * Please do not call this method directly, use the ->blocks syntax. {@link moodle_page::__get()}.
 628       * @return block_manager the blocks manager object for this page.
 629       */
 630      protected function magic_get_blocks() {
 631          global $CFG;
 632          if (is_null($this->_blocks)) {
 633              if (!empty($CFG->blockmanagerclass)) {
 634                  if (!empty($CFG->blockmanagerclassfile)) {
 635                      require_once($CFG->blockmanagerclassfile);
 636                  }
 637                  $classname = $CFG->blockmanagerclass;
 638              } else {
 639                  $classname = 'block_manager';
 640              }
 641              $this->_blocks = new $classname($this);
 642          }
 643          return $this->_blocks;
 644      }
 645  
 646      /**
 647       * Please do not call this method directly, use the ->requires syntax. {@link moodle_page::__get()}.
 648       * @return page_requirements_manager tracks the JavaScript, CSS files, etc. required by this page.
 649       */
 650      protected function magic_get_requires() {
 651          if (is_null($this->_requires)) {
 652              $this->_requires = new page_requirements_manager();
 653          }
 654          return $this->_requires;
 655      }
 656  
 657      /**
 658       * Please do not call this method directly, use the ->cacheable syntax. {@link moodle_page::__get()}.
 659       * @return bool can this page be cached by the user's browser.
 660       */
 661      protected function magic_get_cacheable() {
 662          return $this->_cacheable;
 663      }
 664  
 665      /**
 666       * Please do not call this method directly, use the ->focuscontrol syntax. {@link moodle_page::__get()}.
 667       * @return string the id of the HTML element to be focused when the page has loaded.
 668       */
 669      protected function magic_get_focuscontrol() {
 670          return $this->_focuscontrol;
 671      }
 672  
 673      /**
 674       * Please do not call this method directly, use the ->button syntax. {@link moodle_page::__get()}.
 675       * @return string the HTML to go where the Turn editing on button normally goes.
 676       */
 677      protected function magic_get_button() {
 678          return $this->_button;
 679      }
 680  
 681      /**
 682       * Please do not call this method directly, use the ->theme syntax. {@link moodle_page::__get()}.
 683       * @return theme_config the initialised theme for this page.
 684       */
 685      protected function magic_get_theme() {
 686          if (is_null($this->_theme)) {
 687              $this->initialise_theme_and_output();
 688          }
 689          return $this->_theme;
 690      }
 691  
 692      /**
 693       * Returns an array of minipulations or false if there are none to make.
 694       *
 695       * @since Moodle 2.5.1 2.6
 696       * @return bool|array
 697       */
 698      protected function magic_get_blockmanipulations() {
 699          if (!right_to_left()) {
 700              return false;
 701          }
 702          if (is_null($this->_theme)) {
 703              $this->initialise_theme_and_output();
 704          }
 705          return $this->_theme->blockrtlmanipulations;
 706      }
 707  
 708      /**
 709       * Please do not call this method directly, use the ->devicetypeinuse syntax. {@link moodle_page::__get()}.
 710       * @return string The device type being used.
 711       */
 712      protected function magic_get_devicetypeinuse() {
 713          if (empty($this->_devicetypeinuse)) {
 714              $this->_devicetypeinuse = core_useragent::get_user_device_type();
 715          }
 716          return $this->_devicetypeinuse;
 717      }
 718  
 719      /**
 720       * Please do not call this method directly use the ->periodicrefreshdelay syntax
 721       * {@link moodle_page::__get()}
 722       * @return int The periodic refresh delay to use with meta refresh
 723       */
 724      protected function magic_get_periodicrefreshdelay() {
 725          return $this->_periodicrefreshdelay;
 726      }
 727  
 728      /**
 729       * Please do not call this method directly use the ->opencontainers syntax. {@link moodle_page::__get()}
 730       * @return xhtml_container_stack tracks XHTML tags on this page that have been opened but not closed.
 731       *      mainly for internal use by the rendering code.
 732       */
 733      protected function magic_get_opencontainers() {
 734          if (is_null($this->_opencontainers)) {
 735              $this->_opencontainers = new xhtml_container_stack();
 736          }
 737          return $this->_opencontainers;
 738      }
 739  
 740      /**
 741       * Return the navigation object
 742       * @return global_navigation
 743       */
 744      protected function magic_get_navigation() {
 745          if ($this->_navigation === null) {
 746              $this->_navigation = new global_navigation($this);
 747          }
 748          return $this->_navigation;
 749      }
 750  
 751      /**
 752       * Return a navbar object
 753       * @return navbar
 754       */
 755      protected function magic_get_navbar() {
 756          if ($this->_navbar === null) {
 757              $this->_navbar = new navbar($this);
 758          }
 759          return $this->_navbar;
 760      }
 761  
 762      /**
 763       * Returns the settings navigation object
 764       * @return settings_navigation
 765       */
 766      protected function magic_get_settingsnav() {
 767          if ($this->_settingsnav === null) {
 768              $this->_settingsnav = new settings_navigation($this);
 769              $this->_settingsnav->initialise();
 770          }
 771          return $this->_settingsnav;
 772      }
 773  
 774      /**
 775       * Returns the flat navigation object
 776       * @return flat_navigation
 777       */
 778      protected function magic_get_flatnav() {
 779          if ($this->_flatnav === null) {
 780              $this->_flatnav = new flat_navigation($this);
 781              $this->_flatnav->initialise();
 782          }
 783          return $this->_flatnav;
 784      }
 785  
 786      /**
 787       * Returns request IP address.
 788       *
 789       * @return string IP address or null if unknown
 790       */
 791      protected function magic_get_requestip() {
 792          return getremoteaddr(null);
 793      }
 794  
 795      /**
 796       * Returns the origin of current request.
 797       *
 798       * Note: constants are not required because we need to use these values in logging and reports.
 799       *
 800       * @return string 'web', 'ws', 'cli', 'restore', etc.
 801       */
 802      protected function magic_get_requestorigin() {
 803          if (class_exists('restore_controller', false) && restore_controller::is_executing()) {
 804              return 'restore';
 805          }
 806  
 807          if (WS_SERVER) {
 808              return 'ws';
 809          }
 810  
 811          if (CLI_SCRIPT) {
 812              return 'cli';
 813          }
 814  
 815          return 'web';
 816      }
 817  
 818      /**
 819       * PHP overloading magic to make the $PAGE->course syntax work by redirecting
 820       * it to the corresponding $PAGE->magic_get_course() method if there is one, and
 821       * throwing an exception if not.
 822       *
 823       * @param string $name property name
 824       * @return mixed
 825       * @throws coding_exception
 826       */
 827      public function __get($name) {
 828          $getmethod = 'magic_get_' . $name;
 829          if (method_exists($this, $getmethod)) {
 830              return $this->$getmethod();
 831          } else {
 832              throw new coding_exception('Unknown property ' . $name . ' of $PAGE.');
 833          }
 834      }
 835  
 836      /**
 837       * PHP overloading magic to catch obvious coding errors.
 838       *
 839       * This method has been created to catch obvious coding errors where the
 840       * developer has tried to set a page property using $PAGE->key = $value.
 841       * In the moodle_page class all properties must be set using the appropriate
 842       * $PAGE->set_something($value) method.
 843       *
 844       * @param string $name property name
 845       * @param mixed $value Value
 846       * @return void Throws exception if field not defined in page class
 847       * @throws coding_exception
 848       */
 849      public function __set($name, $value) {
 850          if (method_exists($this, 'set_' . $name)) {
 851              throw new coding_exception('Invalid attempt to modify page object', "Use \$PAGE->set_$name() instead.");
 852          } else {
 853              throw new coding_exception('Invalid attempt to modify page object', "Unknown property $name");
 854          }
 855      }
 856  
 857      // Other information getting methods ==========================================.
 858  
 859      /**
 860       * Returns instance of page renderer
 861       *
 862       * @param string $component name such as 'core', 'mod_forum' or 'qtype_multichoice'.
 863       * @param string $subtype optional subtype such as 'news' resulting to 'mod_forum_news'
 864       * @param string $target one of rendering target constants
 865       * @return renderer_base
 866       */
 867      public function get_renderer($component, $subtype = null, $target = null) {
 868          if ($this->pagelayout === 'maintenance') {
 869              // If the page is using the maintenance layout then we're going to force target to maintenance.
 870              // This leads to a special core renderer that is designed to block access to API's that are likely unavailable for this
 871              // page layout.
 872              $target = RENDERER_TARGET_MAINTENANCE;
 873          }
 874          return $this->magic_get_theme()->get_renderer($this, $component, $subtype, $target);
 875      }
 876  
 877      /**
 878       * Checks to see if there are any items on the navbar object
 879       *
 880       * @return bool true if there are, false if not
 881       */
 882      public function has_navbar() {
 883          if ($this->_navbar === null) {
 884              $this->_navbar = new navbar($this);
 885          }
 886          return $this->_navbar->has_items();
 887      }
 888  
 889      /**
 890       * Switches from the regular requirements manager to the fragment requirements manager to
 891       * capture all necessary JavaScript to display a chunk of HTML such as an mform. This is for use
 892       * by the get_fragment() web service and not for use elsewhere.
 893       */
 894      public function start_collecting_javascript_requirements() {
 895          global $CFG;
 896          require_once($CFG->libdir.'/outputfragmentrequirementslib.php');
 897  
 898          // Check that the requirements manager has not already been switched.
 899          if (get_class($this->_requires) == 'fragment_requirements_manager') {
 900              throw new coding_exception('JavaScript collection has already been started.');
 901          }
 902          // The header needs to have been called to flush out the generic JavaScript for the page. This allows only
 903          // JavaScript for the fragment to be collected. _wherethemewasinitialised is set when header() is called.
 904          if (!empty($this->_wherethemewasinitialised)) {
 905              // Change the current requirements manager over to the fragment manager to capture JS.
 906              $this->savedrequires = $this->_requires;
 907              $this->_requires = new fragment_requirements_manager();
 908          } else {
 909              throw new coding_exception('$OUTPUT->header() needs to be called before collecting JavaScript requirements.');
 910          }
 911      }
 912  
 913      /**
 914       * Switches back from collecting fragment JS requirement to the original requirement manager
 915       */
 916      public function end_collecting_javascript_requirements() {
 917          if ($this->savedrequires === null) {
 918              throw new coding_exception('JavaScript collection has not been started.');
 919          }
 920          $this->_requires = $this->savedrequires;
 921          $this->savedrequires = null;
 922      }
 923  
 924      /**
 925       * Should the current user see this page in editing mode.
 926       * That is, are they allowed to edit this page, and are they currently in
 927       * editing mode.
 928       * @return bool
 929       */
 930      public function user_is_editing() {
 931          global $USER;
 932          return !empty($USER->editing) && $this->user_allowed_editing();
 933      }
 934  
 935      /**
 936       * Does the user have permission to edit blocks on this page.
 937       * @return bool
 938       */
 939      public function user_can_edit_blocks() {
 940          return has_capability($this->_blockseditingcap, $this->_context);
 941      }
 942  
 943      /**
 944       * Does the user have permission to see this page in editing mode.
 945       * @return bool
 946       */
 947      public function user_allowed_editing() {
 948          return has_any_capability($this->all_editing_caps(), $this->_context);
 949      }
 950  
 951      /**
 952       * Get a description of this page. Normally displayed in the footer in developer debug mode.
 953       * @return string
 954       */
 955      public function debug_summary() {
 956          $summary = '';
 957          $summary .= 'General type: ' . $this->pagelayout . '. ';
 958          if (!during_initial_install()) {
 959              $summary .= 'Context ' . $this->context->get_context_name() . ' (context id ' . $this->_context->id . '). ';
 960          }
 961          $summary .= 'Page type ' . $this->pagetype .  '. ';
 962          if ($this->subpage) {
 963              $summary .= 'Sub-page ' . $this->subpage .  '. ';
 964          }
 965          return $summary;
 966      }
 967  
 968      // Setter methods =============================================================.
 969  
 970      /**
 971       * Set the state.
 972       *
 973       * The state must be one of that STATE_... constants, and the state is only allowed to advance one step at a time.
 974       *
 975       * @param int $state The new state.
 976       * @throws coding_exception
 977       */
 978      public function set_state($state) {
 979          if ($state != $this->_state + 1 || $state > self::STATE_DONE) {
 980              throw new coding_exception('Invalid state passed to moodle_page::set_state. We are in state ' .
 981                      $this->_state . ' and state ' . $state . ' was requested.');
 982          }
 983  
 984          if ($state == self::STATE_PRINTING_HEADER) {
 985              $this->starting_output();
 986          }
 987  
 988          $this->_state = $state;
 989      }
 990  
 991      /**
 992       * Set the current course. This sets both $PAGE->course and $COURSE. It also
 993       * sets the right theme and locale.
 994       *
 995       * Normally you don't need to call this function yourself, require_login will
 996       * call it for you if you pass a $course to it. You can use this function
 997       * on pages that do need to call require_login().
 998       *
 999       * Sets $PAGE->context to the course context, if it is not already set.
1000       *
1001       * @param stdClass $course the course to set as the global course.
1002       * @throws coding_exception
1003       */
1004      public function set_course($course) {
1005          global $COURSE, $PAGE, $CFG, $SITE;
1006  
1007          if (empty($course->id)) {
1008              throw new coding_exception('$course passed to moodle_page::set_course does not look like a proper course object.');
1009          }
1010  
1011          $this->ensure_theme_not_set();
1012  
1013          if (!empty($this->_course->id) && $this->_course->id != $course->id) {
1014              $this->_categories = null;
1015          }
1016  
1017          $this->_course = clone($course);
1018  
1019          if ($this === $PAGE) {
1020              $COURSE = $this->_course;
1021              moodle_setlocale();
1022          }
1023  
1024          if (!$this->_context) {
1025              $this->set_context(context_course::instance($this->_course->id));
1026          }
1027  
1028          // Notify course format that this page is set for the course.
1029          if ($this->_course->id != $SITE->id) {
1030              require_once($CFG->dirroot.'/course/lib.php');
1031              $courseformat = course_get_format($this->_course);
1032              $this->add_body_class('format-'. $courseformat->get_format());
1033              $courseformat->page_set_course($this);
1034          } else {
1035              $this->add_body_class('format-site');
1036          }
1037      }
1038  
1039      /**
1040       * Set the main context to which this page belongs.
1041       *
1042       * @param context $context a context object. You normally get this with context_xxxx::instance().
1043       */
1044      public function set_context($context) {
1045          if ($context === null) {
1046              // Extremely ugly hack which sets context to some value in order to prevent warnings,
1047              // use only for core error handling!!!!
1048              if (!$this->_context) {
1049                  $this->_context = context_system::instance();
1050              }
1051              return;
1052          }
1053          // Ideally we should set context only once.
1054          if (isset($this->_context) && $context->id !== $this->_context->id) {
1055              $current = $this->_context->contextlevel;
1056              if ($current == CONTEXT_SYSTEM or $current == CONTEXT_COURSE) {
1057                  // Hmm - not ideal, but it might produce too many warnings due to the design of require_login.
1058              } else if ($current == CONTEXT_MODULE and ($parentcontext = $context->get_parent_context()) and
1059                  $this->_context->id == $parentcontext->id) {
1060                  // Hmm - most probably somebody did require_login() and after that set the block context.
1061              } else {
1062                  // We do not want devs to do weird switching of context levels on the fly because we might have used
1063                  // the context already such as in text filter in page title.
1064                  debugging("Coding problem: unsupported modification of PAGE->context from {$current} to {$context->contextlevel}");
1065              }
1066          }
1067  
1068          $this->_context = $context;
1069      }
1070  
1071      /**
1072       * The course module that this page belongs to (if it does belong to one).
1073       *
1074       * @param stdClass|cm_info $cm a record from course_modules table or cm_info from get_fast_modinfo().
1075       * @param stdClass $course
1076       * @param stdClass $module
1077       * @return void
1078       * @throws coding_exception
1079       */
1080      public function set_cm($cm, $course = null, $module = null) {
1081          global $DB, $CFG, $SITE;
1082  
1083          if (!isset($cm->id) || !isset($cm->course)) {
1084              throw new coding_exception('Invalid $cm. It has to be instance of cm_info or record from the course_modules table.');
1085          }
1086  
1087          if (!$this->_course || $this->_course->id != $cm->course) {
1088              if (!$course) {
1089                  $course = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
1090              }
1091              if ($course->id != $cm->course) {
1092                  throw new coding_exception('The course you passed to $PAGE->set_cm does not correspond to the $cm.');
1093              }
1094              $this->set_course($course);
1095          }
1096  
1097          // Make sure we have a $cm from get_fast_modinfo as this contains activity access details.
1098          if (!($cm instanceof cm_info)) {
1099              $modinfo = get_fast_modinfo($this->_course);
1100              $cm = $modinfo->get_cm($cm->id);
1101          }
1102          $this->_cm = $cm;
1103  
1104          // Unfortunately the context setting is a mess.
1105          // Let's try to work around some common block problems and show some debug messages.
1106          if (empty($this->_context) or $this->_context->contextlevel != CONTEXT_BLOCK) {
1107              $context = context_module::instance($cm->id);
1108              $this->set_context($context);
1109          }
1110  
1111          if ($module) {
1112              $this->set_activity_record($module);
1113          }
1114  
1115          // Notify course format that this page is set for the course module.
1116          if ($this->_course->id != $SITE->id) {
1117              require_once($CFG->dirroot.'/course/lib.php');
1118              course_get_format($this->_course)->page_set_cm($this);
1119          }
1120      }
1121  
1122      /**
1123       * Sets the activity record. This could be a row from the main table for a
1124       * module. For instance if the current module (cm) is a forum this should be a row
1125       * from the forum table.
1126       *
1127       * @param stdClass $module A row from the main database table for the module that this page belongs to.
1128       * @throws coding_exception
1129       */
1130      public function set_activity_record($module) {
1131          if (is_null($this->_cm)) {
1132              throw new coding_exception('You cannot call $PAGE->set_activity_record until after $PAGE->cm has been set.');
1133          }
1134          if ($module->id != $this->_cm->instance || $module->course != $this->_course->id) {
1135              throw new coding_exception('The activity record does not seem to correspond to the cm that has been set.');
1136          }
1137          $this->_module = $module;
1138      }
1139  
1140      /**
1141       * Sets the pagetype to use for this page.
1142       *
1143       * Normally you do not need to set this manually, it is automatically created
1144       * from the script name. However, on some pages this is overridden.
1145       * For example the page type for course/view.php includes the course format,
1146       * for example 'course-view-weeks'. This gets used as the id attribute on
1147       * <body> and also for determining which blocks are displayed.
1148       *
1149       * @param string $pagetype e.g. 'my-index' or 'mod-quiz-attempt'.
1150       */
1151      public function set_pagetype($pagetype) {
1152          $this->_pagetype = $pagetype;
1153      }
1154  
1155      /**
1156       * Sets the layout to use for this page.
1157       *
1158       * The page layout determines how the page will be displayed, things such as
1159       * block regions, content areas, etc are controlled by the layout.
1160       * The theme in use for the page will determine that the layout contains.
1161       *
1162       * This properly defaults to 'base', so you only need to call this function if
1163       * you want something different. The exact range of supported layouts is specified
1164       * in the standard theme.
1165       *
1166       * For an idea of the common page layouts see
1167       * {@link http://docs.moodle.org/dev/Themes_2.0#The_different_layouts_as_of_August_17th.2C_2010}
1168       * But please keep in mind that it may be (and normally is) out of date.
1169       * The only place to find an accurate up-to-date list of the page layouts
1170       * available for your version of Moodle is {@link theme/base/config.php}
1171       *
1172       * @param string $pagelayout the page layout this is. For example 'popup', 'home'.
1173       */
1174      public function set_pagelayout($pagelayout) {
1175          global $SESSION;
1176  
1177          if (!empty($SESSION->forcepagelayout)) {
1178              $this->_pagelayout = $SESSION->forcepagelayout;
1179          } else {
1180              // Uncomment this to debug theme pagelayout issues like missing blocks.
1181              // if (!empty($this->_wherethemewasinitialised) && $pagelayout != $this->_pagelayout)
1182              //     debugging('Page layout has already been set and cannot be changed.', DEBUG_DEVELOPER);
1183              $this->_pagelayout = $pagelayout;
1184          }
1185      }
1186  
1187      /**
1188       * If context->id and pagetype are not enough to uniquely identify this page,
1189       * then you can set a subpage id as well. For example, the tags page sets
1190       *
1191       * @param string $subpage an arbitrary identifier that, along with context->id
1192       *      and pagetype, uniquely identifies this page.
1193       */
1194      public function set_subpage($subpage) {
1195          if (empty($subpage)) {
1196              $this->_subpage = '';
1197          } else {
1198              $this->_subpage = $subpage;
1199          }
1200      }
1201  
1202      /**
1203       * Adds a CSS class to the body tag of the page.
1204       *
1205       * @param string $class add this class name ot the class attribute on the body tag.
1206       * @throws coding_exception
1207       */
1208      public function add_body_class($class) {
1209          if ($this->_state > self::STATE_BEFORE_HEADER) {
1210              throw new coding_exception('Cannot call moodle_page::add_body_class after output has been started.');
1211          }
1212          $this->_bodyclasses[$class] = 1;
1213      }
1214  
1215      /**
1216       * Adds an array of body classes to the body tag of this page.
1217       *
1218       * @param array $classes this utility method calls add_body_class for each array element.
1219       */
1220      public function add_body_classes($classes) {
1221          foreach ($classes as $class) {
1222              $this->add_body_class($class);
1223          }
1224      }
1225  
1226      /**
1227       * Sets the title for the page.
1228       * This is normally used within the title tag in the head of the page.
1229       *
1230       * @param string $title the title that should go in the <head> section of the HTML of this page.
1231       */
1232      public function set_title($title) {
1233          $title = format_string($title);
1234          $title = strip_tags($title);
1235          $title = str_replace('"', '&quot;', $title);
1236          $this->_title = $title;
1237      }
1238  
1239      /**
1240       * Sets the heading to use for the page.
1241       * This is normally used as the main heading at the top of the content.
1242       *
1243       * @param string $heading the main heading that should be displayed at the top of the <body>.
1244       * @param bool $applyformatting apply format_string() - by default true.
1245       */
1246      public function set_heading($heading, bool $applyformatting = true) {
1247          $this->_heading = $applyformatting ? format_string($heading) : clean_text($heading);
1248      }
1249  
1250      /**
1251       * Sets some HTML to use next to the heading {@link moodle_page::set_heading()}
1252       *
1253       * @param string $menu The menu/content to show in the heading
1254       */
1255      public function set_headingmenu($menu) {
1256          $this->_headingmenu = $menu;
1257      }
1258  
1259      /**
1260       * Set the course category this page belongs to manually.
1261       *
1262       * This automatically sets $PAGE->course to be the site course. You cannot
1263       * use this method if you have already set $PAGE->course - in that case,
1264       * the category must be the one that the course belongs to. This also
1265       * automatically sets the page context to the category context.
1266       *
1267       * @param int $categoryid The id of the category to set.
1268       * @throws coding_exception
1269       */
1270      public function set_category_by_id($categoryid) {
1271          global $SITE;
1272          if (!is_null($this->_course)) {
1273              throw new coding_exception('Course has already been set. You cannot change the category now.');
1274          }
1275          if (is_array($this->_categories)) {
1276              throw new coding_exception('Course category has already been set. You cannot to change it now.');
1277          }
1278          $this->ensure_theme_not_set();
1279          $this->set_course($SITE);
1280          $this->load_category($categoryid);
1281          $this->set_context(context_coursecat::instance($categoryid));
1282      }
1283  
1284      /**
1285       * Set a different path to use for the 'Moodle docs for this page' link.
1286       *
1287       * By default, it uses the pagetype, which is normally the same as the
1288       * script name. So, for example, for mod/quiz/attempt.php, pagetype is
1289       * mod-quiz-attempt, and so docspath is mod/quiz/attempt.
1290       *
1291       * @param string $path the path to use at the end of the moodle docs URL.
1292       */
1293      public function set_docs_path($path) {
1294          $this->_docspath = $path;
1295      }
1296  
1297      /**
1298       * You should call this method from every page to set the URL that should be used to return to this page.
1299       *
1300       * Used, for example, by the blocks editing UI to know where to return the
1301       * user after an action.
1302       * For example, course/view.php does:
1303       *      $id = optional_param('id', 0, PARAM_INT);
1304       *      $PAGE->set_url('/course/view.php', array('id' => $id));
1305       *
1306       * @param moodle_url|string $url URL relative to $CFG->wwwroot or {@link moodle_url} instance
1307       * @param array $params parameters to add to the URL
1308       * @throws coding_exception
1309       */
1310      public function set_url($url, array $params = null) {
1311          global $CFG;
1312  
1313          if (is_string($url) && strpos($url, 'http') !== 0) {
1314              if (strpos($url, '/') === 0) {
1315                  // Add the wwwroot to the relative url.
1316                  $url = $CFG->wwwroot . $url;
1317              } else {
1318                  throw new coding_exception('Invalid parameter $url, has to be full url or in shortened form starting with /.');
1319              }
1320          }
1321  
1322          $this->_url = new moodle_url($url, $params);
1323  
1324          $fullurl = $this->_url->out_omit_querystring();
1325          if (strpos($fullurl, "$CFG->wwwroot/") !== 0) {
1326              debugging('Most probably incorrect set_page() url argument, it does not match the wwwroot!');
1327          }
1328          $shorturl = str_replace("$CFG->wwwroot/", '', $fullurl);
1329  
1330          if (is_null($this->_pagetype)) {
1331              $this->initialise_default_pagetype($shorturl);
1332          }
1333      }
1334  
1335      /**
1336       * Make sure page URL does not contain the given URL parameter.
1337       *
1338       * This should not be necessary if the script has called set_url properly.
1339       * However, in some situations like the block editing actions; when the URL
1340       * has been guessed, it will contain dangerous block-related actions.
1341       * Therefore, the blocks code calls this function to clean up such parameters
1342       * before doing any redirect.
1343       *
1344       * @param string $param the name of the parameter to make sure is not in the
1345       * page URL.
1346       */
1347      public function ensure_param_not_in_url($param) {
1348          $this->_url->remove_params($param);
1349      }
1350  
1351      /**
1352       * Sets an alternative version of this page.
1353       *
1354       * There can be alternate versions of some pages (for example an RSS feed version).
1355       * Call this method for each alternative version available.
1356       * For each alternative version a link will be included in the <head> tag.
1357       *
1358       * @param string $title The title to give the alternate version.
1359       * @param string|moodle_url $url The URL of the alternate version.
1360       * @param string $mimetype The mime-type of the alternate version.
1361       * @throws coding_exception
1362       */
1363      public function add_alternate_version($title, $url, $mimetype) {
1364          if ($this->_state > self::STATE_BEFORE_HEADER) {
1365              throw new coding_exception('Cannot call moodle_page::add_alternate_version after output has been started.');
1366          }
1367          $alt = new stdClass;
1368          $alt->title = $title;
1369          $alt->url = $url;
1370          $this->_alternateversions[$mimetype] = $alt;
1371      }
1372  
1373      /**
1374       * Specify a form control should be focused when the page has loaded.
1375       *
1376       * @param string $controlid the id of the HTML element to be focused.
1377       */
1378      public function set_focuscontrol($controlid) {
1379          $this->_focuscontrol = $controlid;
1380      }
1381  
1382      /**
1383       * Specify a fragment of HTML that goes where the 'Turn editing on' button normally goes.
1384       *
1385       * @param string $html the HTML to display there.
1386       */
1387      public function set_button($html) {
1388          $this->_button = $html;
1389      }
1390  
1391      /**
1392       * Set the capability that allows users to edit blocks on this page.
1393       *
1394       * Normally the default of 'moodle/site:manageblocks' is used, but a few
1395       * pages like the My Moodle page need to use a different capability
1396       * like 'moodle/my:manageblocks'.
1397       *
1398       * @param string $capability a capability.
1399       */
1400      public function set_blocks_editing_capability($capability) {
1401          $this->_blockseditingcap = $capability;
1402      }
1403  
1404      /**
1405       * Some pages let you turn editing on for reasons other than editing blocks.
1406       * If that is the case, you can pass other capabilities that let the user
1407       * edit this page here.
1408       *
1409       * @param string|array $capability either a capability, or an array of capabilities.
1410       */
1411      public function set_other_editing_capability($capability) {
1412          if (is_array($capability)) {
1413              $this->_othereditingcaps = array_unique($this->_othereditingcaps + $capability);
1414          } else {
1415              $this->_othereditingcaps[] = $capability;
1416          }
1417      }
1418  
1419      /**
1420       * Sets whether the browser should cache this page or not.
1421       *
1422       * @param bool $cacheable can this page be cached by the user's browser.
1423       */
1424      public function set_cacheable($cacheable) {
1425          $this->_cacheable = $cacheable;
1426      }
1427  
1428      /**
1429       * Sets the page to periodically refresh
1430       *
1431       * This function must be called before $OUTPUT->header has been called or
1432       * a coding exception will be thrown.
1433       *
1434       * @param int $delay Sets the delay before refreshing the page, if set to null refresh is cancelled.
1435       * @throws coding_exception
1436       */
1437      public function set_periodic_refresh_delay($delay = null) {
1438          if ($this->_state > self::STATE_BEFORE_HEADER) {
1439              throw new coding_exception('You cannot set a periodic refresh delay after the header has been printed');
1440          }
1441          if ($delay === null) {
1442              $this->_periodicrefreshdelay = null;
1443          } else if (is_int($delay)) {
1444              $this->_periodicrefreshdelay = $delay;
1445          }
1446      }
1447  
1448      /**
1449       * Force this page to use a particular theme.
1450       *
1451       * Please use this cautiously.
1452       * It is only intended to be used by the themes selector admin page.
1453       *
1454       * @param string $themename the name of the theme to use.
1455       */
1456      public function force_theme($themename) {
1457          $this->ensure_theme_not_set();
1458          $this->_theme = theme_config::load($themename);
1459      }
1460  
1461      /**
1462       * Reload theme settings.
1463       *
1464       * This is used when we need to reset settings
1465       * because they are now double cached in theme.
1466       */
1467      public function reload_theme() {
1468          if (!is_null($this->_theme)) {
1469              $this->_theme = theme_config::load($this->_theme->name);
1470          }
1471      }
1472  
1473      /**
1474       * @deprecated since Moodle 3.4
1475       */
1476      public function https_required() {
1477          throw new coding_exception('https_required() cannot be used anymore.');
1478      }
1479  
1480      /**
1481       * @deprecated since Moodle 3.4
1482       */
1483      public function verify_https_required() {
1484          throw new coding_exception('verify_https_required() cannot be used anymore.');
1485      }
1486  
1487      // Initialisation methods =====================================================
1488      // These set various things up in a default way.
1489  
1490      /**
1491       * This method is called when the page first moves out of the STATE_BEFORE_HEADER
1492       * state. This is our last change to initialise things.
1493       */
1494      protected function starting_output() {
1495          global $CFG;
1496  
1497          if (!during_initial_install()) {
1498              $this->blocks->load_blocks();
1499              if (empty($this->_block_actions_done)) {
1500                  $this->_block_actions_done = true;
1501                  if ($this->blocks->process_url_actions($this)) {
1502                      redirect($this->url->out(false));
1503                  }
1504              }
1505              $this->blocks->create_all_block_instances();
1506          }
1507  
1508          // If maintenance mode is on, change the page header.
1509          if (!empty($CFG->maintenance_enabled)) {
1510              $this->set_button('<a href="' . $CFG->wwwroot . '/' . $CFG->admin .
1511                      '/settings.php?section=maintenancemode">' . get_string('maintenancemode', 'admin') .
1512                      '</a> ' . $this->button);
1513  
1514              $title = $this->title;
1515              if ($title) {
1516                  $title .= ' - ';
1517              }
1518              $this->set_title($title . get_string('maintenancemode', 'admin'));
1519          }
1520  
1521          $this->initialise_standard_body_classes();
1522      }
1523  
1524      /**
1525       * Method for use by Moodle core to set up the theme. Do not
1526       * use this in your own code.
1527       *
1528       * Make sure the right theme for this page is loaded. Tell our
1529       * blocks_manager about the theme block regions, and then, if
1530       * we are $PAGE, set up the global $OUTPUT.
1531       *
1532       * @return void
1533       */
1534      public function initialise_theme_and_output() {
1535          global $OUTPUT, $PAGE, $SITE, $CFG;
1536  
1537          if (!empty($this->_wherethemewasinitialised)) {
1538              return;
1539          }
1540  
1541          if (!during_initial_install()) {
1542              // Detect PAGE->context mess.
1543              $this->magic_get_context();
1544          }
1545  
1546          if (!$this->_course && !during_initial_install()) {
1547              $this->set_course($SITE);
1548          }
1549  
1550          if (is_null($this->_theme)) {
1551              $themename = $this->resolve_theme();
1552              $this->_theme = theme_config::load($themename);
1553          }
1554  
1555          $this->_theme->setup_blocks($this->pagelayout, $this->blocks);
1556  
1557          if ($this === $PAGE) {
1558              $target = null;
1559              if ($this->pagelayout === 'maintenance') {
1560                  // If the page is using the maintenance layout then we're going to force target to maintenance.
1561                  // This leads to a special core renderer that is designed to block access to API's that are likely unavailable for this
1562                  // page layout.
1563                  $target = RENDERER_TARGET_MAINTENANCE;
1564              }
1565              $OUTPUT = $this->get_renderer('core', null, $target);
1566          }
1567  
1568          if (!during_initial_install()) {
1569              $filtermanager = filter_manager::instance();
1570              $filtermanager->setup_page_for_globally_available_filters($this);
1571          }
1572  
1573          $this->_wherethemewasinitialised = debug_backtrace();
1574      }
1575  
1576      /**
1577       * For diagnostic/debugging purposes, find where the theme setup was triggered.
1578       *
1579       * @return null|array null if theme not yet setup. Stacktrace if it was.
1580       */
1581      public function get_where_theme_was_initialised() {
1582          return $this->_wherethemewasinitialised;
1583      }
1584  
1585      /**
1586       * Reset the theme and output for a new context. This only makes sense from
1587       * external::validate_context(). Do not cheat.
1588       *
1589       * @return string the name of the theme that should be used on this page.
1590       */
1591      public function reset_theme_and_output() {
1592          global $COURSE, $SITE;
1593  
1594          $COURSE = clone($SITE);
1595          $this->_theme = null;
1596          $this->_wherethemewasinitialised = null;
1597          $this->_course = null;
1598          $this->_cm = null;
1599          $this->_module = null;
1600          $this->_context = null;
1601      }
1602  
1603      /**
1604       * Work out the theme this page should use.
1605       *
1606       * This depends on numerous $CFG settings, and the properties of this page.
1607       *
1608       * @return string the name of the theme that should be used on this page.
1609       */
1610      protected function resolve_theme() {
1611          global $CFG, $USER, $SESSION;
1612  
1613          if (empty($CFG->themeorder)) {
1614              $themeorder = array('course', 'category', 'session', 'user', 'cohort', 'site');
1615          } else {
1616              $themeorder = $CFG->themeorder;
1617              // Just in case, make sure we always use the site theme if nothing else matched.
1618              $themeorder[] = 'site';
1619          }
1620  
1621          $mnetpeertheme = '';
1622          $mnetvarsok = isset($CFG->mnet_localhost_id) && isset($USER->mnethostid);
1623          if (isloggedin() and $mnetvarsok and $USER->mnethostid != $CFG->mnet_localhost_id) {
1624              require_once($CFG->dirroot.'/mnet/peer.php');
1625              $mnetpeer = new mnet_peer();
1626              $mnetpeer->set_id($USER->mnethostid);
1627              if ($mnetpeer->force_theme == 1 && $mnetpeer->theme != '') {
1628                  $mnetpeertheme = $mnetpeer->theme;
1629              }
1630          }
1631  
1632          $devicetheme = core_useragent::get_device_type_theme($this->devicetypeinuse);
1633  
1634          // The user is using another device than default, and we have a theme for that, we should use it.
1635          $hascustomdevicetheme = core_useragent::DEVICETYPE_DEFAULT != $this->devicetypeinuse && !empty($devicetheme);
1636  
1637          foreach ($themeorder as $themetype) {
1638  
1639              switch ($themetype) {
1640                  case 'course':
1641                      if (!empty($CFG->allowcoursethemes) && !empty($this->_course->theme) && !$hascustomdevicetheme) {
1642                          return $this->_course->theme;
1643                      }
1644                  break;
1645  
1646                  case 'category':
1647                      if (!empty($CFG->allowcategorythemes) && !empty($this->_course) && !$hascustomdevicetheme) {
1648                          $categories = $this->categories;
1649                          foreach ($categories as $category) {
1650                              if (!empty($category->theme)) {
1651                                  return $category->theme;
1652                              }
1653                          }
1654                      }
1655                  break;
1656  
1657                  case 'session':
1658                      if (!empty($SESSION->theme)) {
1659                          return $SESSION->theme;
1660                      }
1661                  break;
1662  
1663                  case 'user':
1664                      if (!empty($CFG->allowuserthemes) && !empty($USER->theme) && !$hascustomdevicetheme) {
1665                          if ($mnetpeertheme) {
1666                              return $mnetpeertheme;
1667                          } else {
1668                              return $USER->theme;
1669                          }
1670                      }
1671                  break;
1672  
1673                  case 'cohort':
1674                      if (!empty($CFG->allowcohortthemes) && !empty($USER->cohorttheme) && !$hascustomdevicetheme) {
1675                          return $USER->cohorttheme;
1676                      }
1677                  break;
1678  
1679                  case 'site':
1680                      if ($mnetpeertheme) {
1681                          return $mnetpeertheme;
1682                      }
1683                      // First try for the device the user is using.
1684                      if (!empty($devicetheme)) {
1685                          return $devicetheme;
1686                      }
1687                      // Next try for the default device (as a fallback).
1688                      $devicetheme = core_useragent::get_device_type_theme(core_useragent::DEVICETYPE_DEFAULT);
1689                      if (!empty($devicetheme)) {
1690                          return $devicetheme;
1691                      }
1692                      // The default device theme isn't set up - use the overall default theme.
1693                      return theme_config::DEFAULT_THEME;
1694              }
1695          }
1696  
1697          // We should most certainly have resolved a theme by now. Something has gone wrong.
1698          debugging('Error resolving the theme to use for this page.', DEBUG_DEVELOPER);
1699          return theme_config::DEFAULT_THEME;
1700      }
1701  
1702  
1703      /**
1704       * Sets ->pagetype from the script name. For example, if the script that was
1705       * run is mod/quiz/view.php, ->pagetype will be set to 'mod-quiz-view'.
1706       *
1707       * @param string $script the path to the script that should be used to
1708       * initialise ->pagetype. If not passed the $SCRIPT global will be used.
1709       * If legacy code has set $CFG->pagepath that will be used instead, and a
1710       * developer warning issued.
1711       */
1712      protected function initialise_default_pagetype($script = null) {
1713          global $CFG, $SCRIPT;
1714  
1715          if (isset($CFG->pagepath)) {
1716              debugging('Some code appears to have set $CFG->pagepath. That was a horrible deprecated thing. ' .
1717                      'Don\'t do it! Try calling $PAGE->set_pagetype() instead.');
1718              $script = $CFG->pagepath;
1719              unset($CFG->pagepath);
1720          }
1721  
1722          if (is_null($script)) {
1723              $script = ltrim($SCRIPT, '/');
1724              $len = strlen($CFG->admin);
1725              if (substr($script, 0, $len) == $CFG->admin) {
1726                  $script = 'admin' . substr($script, $len);
1727              }
1728          }
1729  
1730          $path = str_replace('.php', '', $script);
1731          if (substr($path, -1) == '/') {
1732              $path .= 'index';
1733          }
1734  
1735          if (empty($path) || $path == 'index') {
1736              $this->_pagetype = 'site-index';
1737          } else {
1738              $this->_pagetype = str_replace('/', '-', $path);
1739          }
1740      }
1741  
1742      /**
1743       * Initialises the CSS classes that will be added to body tag of the page.
1744       *
1745       * The function is responsible for adding all of the critical CSS classes
1746       * that describe the current page, and its state.
1747       * This includes classes that describe the following for example:
1748       *    - Current language
1749       *    - Language direction
1750       *    - YUI CSS initialisation
1751       *    - Pagelayout
1752       * These are commonly used in CSS to target specific types of pages.
1753       */
1754      protected function initialise_standard_body_classes() {
1755          global $CFG, $USER;
1756  
1757          $pagetype = $this->pagetype;
1758          if ($pagetype == 'site-index') {
1759              $this->_legacyclass = 'course';
1760          } else if (substr($pagetype, 0, 6) == 'admin-') {
1761              $this->_legacyclass = 'admin';
1762          }
1763          $this->add_body_class($this->_legacyclass);
1764  
1765          $pathbits = explode('-', trim($pagetype));
1766          for ($i = 1; $i < count($pathbits); $i++) {
1767              $this->add_body_class('path-' . join('-', array_slice($pathbits, 0, $i)));
1768          }
1769  
1770          $this->add_body_classes(core_useragent::get_browser_version_classes());
1771          $this->add_body_class('dir-' . get_string('thisdirection', 'langconfig'));
1772          $this->add_body_class('lang-' . current_language());
1773          $this->add_body_class('yui-skin-sam'); // Make YUI happy, if it is used.
1774          $this->add_body_class('yui3-skin-sam'); // Make YUI3 happy, if it is used.
1775          $this->add_body_class($this->url_to_class_name($CFG->wwwroot));
1776  
1777          // Extra class describing current page layout.
1778          $this->add_body_class('pagelayout-' . $this->_pagelayout);
1779  
1780          if (!during_initial_install()) {
1781              $this->add_body_class('course-' . $this->_course->id);
1782              $this->add_body_class('context-' . $this->_context->id);
1783          }
1784  
1785          if (!empty($this->_cm)) {
1786              $this->add_body_class('cmid-' . $this->_cm->id);
1787          }
1788  
1789          if (!empty($CFG->allowcategorythemes) && !empty($this->_course)) {
1790              $this->ensure_category_loaded();
1791              foreach ($this->_categories as $catid => $notused) {
1792                  $this->add_body_class('category-' . $catid);
1793              }
1794          } else {
1795              $catid = 0;
1796              if (is_array($this->_categories)) {
1797                  $catids = array_keys($this->_categories);
1798                  $catid = reset($catids);
1799              } else if (!empty($this->_course->category)) {
1800                  $catid = $this->_course->category;
1801              }
1802              if ($catid) {
1803                  $this->add_body_class('category-' . $catid);
1804              }
1805          }
1806  
1807          if (!isloggedin()) {
1808              $this->add_body_class('notloggedin');
1809          }
1810  
1811          if ($this->user_is_editing()) {
1812              $this->add_body_class('editing');
1813              if (optional_param('bui_moveid', false, PARAM_INT)) {
1814                  $this->add_body_class('blocks-moving');
1815              }
1816          }
1817  
1818          if (!empty($CFG->blocksdrag)) {
1819              $this->add_body_class('drag');
1820          }
1821  
1822          if ($this->_devicetypeinuse != 'default') {
1823              $this->add_body_class($this->_devicetypeinuse . 'theme');
1824          }
1825  
1826          // Add class for behat site to apply behat related fixes.
1827          if (defined('BEHAT_SITE_RUNNING')) {
1828              $this->add_body_class('behat-site');
1829          }
1830      }
1831  
1832      /**
1833       * Loads the activity record for the current CM object associated with this
1834       * page.
1835       *
1836       * This will load {@link moodle_page::$_module} with a row from the related
1837       * module table in the database.
1838       * For instance if {@link moodle_page::$_cm} is a forum then a row from the
1839       * forum table will be loaded.
1840       */
1841      protected function load_activity_record() {
1842          global $DB;
1843          if (is_null($this->_cm)) {
1844              return;
1845          }
1846          $this->_module = $DB->get_record($this->_cm->modname, array('id' => $this->_cm->instance));
1847      }
1848  
1849      /**
1850       * This function ensures that the category of the current course has been
1851       * loaded, and if not, the function loads it now.
1852       *
1853       * @return void
1854       * @throws coding_exception
1855       */
1856      protected function ensure_category_loaded() {
1857          if (is_array($this->_categories)) {
1858              return; // Already done.
1859          }
1860          if (is_null($this->_course)) {
1861              throw new coding_exception('Attempt to get the course category for this page before the course was set.');
1862          }
1863          if ($this->_course->category == 0) {
1864              $this->_categories = array();
1865          } else {
1866              $this->load_category($this->_course->category);
1867          }
1868      }
1869  
1870      /**
1871       * Loads the requested category into the pages categories array.
1872       *
1873       * @param int $categoryid
1874       * @throws moodle_exception
1875       */
1876      protected function load_category($categoryid) {
1877          global $DB;
1878          $category = $DB->get_record('course_categories', array('id' => $categoryid));
1879          if (!$category) {
1880              throw new moodle_exception('unknowncategory');
1881          }
1882          $this->_categories[$category->id] = $category;
1883          $parentcategoryids = explode('/', trim($category->path, '/'));
1884          array_pop($parentcategoryids);
1885          foreach (array_reverse($parentcategoryids) as $catid) {
1886              $this->_categories[$catid] = null;
1887          }
1888      }
1889  
1890      /**
1891       * Ensures that the category the current course is within, as well as all of
1892       * its parent categories, have been loaded.
1893       *
1894       * @return void
1895       */
1896      protected function ensure_categories_loaded() {
1897          global $DB;
1898          $this->ensure_category_loaded();
1899          if (!is_null(end($this->_categories))) {
1900              return; // Already done.
1901          }
1902          $idstoload = array_keys($this->_categories);
1903          array_shift($idstoload);
1904          $categories = $DB->get_records_list('course_categories', 'id', $idstoload);
1905          foreach ($idstoload as $catid) {
1906              $this->_categories[$catid] = $categories[$catid];
1907          }
1908      }
1909  
1910      /**
1911       * Ensure the theme has not been loaded yet. If it has an exception is thrown.
1912       *
1913       * @throws coding_exception
1914       */
1915      protected function ensure_theme_not_set() {
1916          // This is explicitly allowed for webservices though which may process many course contexts in a single request.
1917          if (WS_SERVER) {
1918              return;
1919          }
1920  
1921          if (!is_null($this->_theme)) {
1922              throw new coding_exception('The theme has already been set up for this page ready for output. ' .
1923                      'Therefore, you can no longer change the theme, or anything that might affect what ' .
1924                      'the current theme is, for example, the course.',
1925                      'Stack trace when the theme was set up: ' . format_backtrace($this->_wherethemewasinitialised));
1926          }
1927      }
1928  
1929      /**
1930       * Converts the provided URL into a CSS class that be used within the page.
1931       * This is primarily used to add the wwwroot to the body tag as a CSS class.
1932       *
1933       * @param string $url
1934       * @return string
1935       */
1936      protected function url_to_class_name($url) {
1937          $bits = parse_url($url);
1938          $class = str_replace('.', '-', $bits['host']);
1939          if (!empty($bits['port'])) {
1940              $class .= '--' . $bits['port'];
1941          }
1942          if (!empty($bits['path'])) {
1943              $path = trim($bits['path'], '/');
1944              if ($path) {
1945                  $class .= '--' . str_replace('/', '-', $path);
1946              }
1947          }
1948          return $class;
1949      }
1950  
1951      /**
1952       * Combines all of the required editing caps for the page and returns them
1953       * as an array.
1954       *
1955       * @return array
1956       */
1957      protected function all_editing_caps() {
1958          $caps = $this->_othereditingcaps;
1959          $caps[] = $this->_blockseditingcap;
1960          return $caps;
1961      }
1962  
1963      /**
1964       * Returns true if the page URL has beem set.
1965       *
1966       * @return bool
1967       */
1968      public function has_set_url() {
1969          return ($this->_url!==null);
1970      }
1971  
1972      /**
1973       * Gets set when the block actions for the page have been processed.
1974       *
1975       * @param bool $setting
1976       */
1977      public function set_block_actions_done($setting = true) {
1978          $this->_block_actions_done = $setting;
1979      }
1980  
1981      /**
1982       * Are popup notifications allowed on this page?
1983       * Popup notifications may be disallowed in situations such as while upgrading or completing a quiz
1984       *
1985       * @return bool true if popup notifications may be displayed
1986       */
1987      public function get_popup_notification_allowed() {
1988          return $this->_popup_notification_allowed;
1989      }
1990  
1991      /**
1992       * Allow or disallow popup notifications on this page. Popups are allowed by default.
1993       *
1994       * @param bool $allowed true if notifications are allowed. False if not allowed. They are allowed by default.
1995       */
1996      public function set_popup_notification_allowed($allowed) {
1997          $this->_popup_notification_allowed = $allowed;
1998      }
1999  
2000      /**
2001       * Returns the block region having made any required theme manipulations.
2002       *
2003       * @since Moodle 2.5.1 2.6
2004       * @param string $region
2005       * @return string
2006       */
2007      public function apply_theme_region_manipulations($region) {
2008          if ($this->blockmanipulations && isset($this->blockmanipulations[$region])) {
2009              $regionwas = $region;
2010              $regionnow = $this->blockmanipulations[$region];
2011              if ($this->blocks->is_known_region($regionwas) && $this->blocks->is_known_region($regionnow)) {
2012                  // Both the before and after regions are known so we can swap them over.
2013                  return $regionnow;
2014              }
2015              // We didn't know about both, we won't swap them over.
2016              return $regionwas;
2017          }
2018          return $region;
2019      }
2020  
2021      /**
2022       * Add a report node and a specific report to the navigation.
2023       *
2024       * @param int $userid The user ID that we are looking to add this report node to.
2025       * @param array $nodeinfo Name and url of the final node that we are creating.
2026       */
2027      public function add_report_nodes($userid, $nodeinfo) {
2028          global $USER;
2029          // Try to find the specific user node.
2030          $newusernode = $this->navigation->find('user' . $userid, null);
2031          $reportnode = null;
2032          $navigationnodeerror =
2033                  'Could not find the navigation node requested. Please check that the node you are looking for exists.';
2034          if ($userid != $USER->id  || $this->context->contextlevel == CONTEXT_COURSE) {
2035              // Within a course context we need to properly indicate how we have come to the page,
2036              // regardless of whether it's currently logged in user or not.
2037              // Check that we have a valid node.
2038              if (empty($newusernode)) {
2039                  // Throw an error if we ever reach here.
2040                  throw new coding_exception($navigationnodeerror);
2041              }
2042              // Add 'Reports' to the user node.
2043              $reportnode = $newusernode->add(get_string('reports'));
2044          } else {
2045              // We are looking at our own profile.
2046              $myprofilenode = $this->settingsnav->find('myprofile', null);
2047              // Check that we do end up with a valid node.
2048              if (empty($myprofilenode)) {
2049                  // Throw an error if we ever reach here.
2050                  throw new coding_exception($navigationnodeerror);
2051              }
2052              // Add 'Reports' to our node.
2053              $reportnode = $myprofilenode->add(get_string('reports'));
2054          }
2055          // Finally add the report to the navigation tree.
2056          $reportnode->add($nodeinfo['name'], $nodeinfo['url'], navigation_node::TYPE_CUSTOM, null, null,
2057              new pix_icon('i/report', $nodeinfo['name']));
2058      }
2059  
2060      /**
2061       * Add some HTML to the list of actions to render in the header actions menu.
2062       *
2063       * @param string $html The HTML to add.
2064       */
2065      public function add_header_action(string $html) : void {
2066          $this->_headeractions[] = $html;
2067      }
2068  
2069      /**
2070       * Get the list of HTML for actions to render in the header actions menu.
2071       *
2072       * @return string[]
2073       */
2074      public function get_header_actions() : array {
2075          return $this->_headeractions;
2076      }
2077  
2078      /**
2079       * Set the flag to indicate if the region main settings should be rendered as an action
2080       * in the header actions menu rather than at the top of the content.
2081       *
2082       * @param bool $value If the settings should be in the header.
2083       */
2084      public function set_include_region_main_settings_in_header_actions(bool $value) : void {
2085          $this->_regionmainsettingsinheader = $value;
2086      }
2087  
2088      /**
2089       * Check if the  region main settings should be rendered as an action in the header actions
2090       * menu rather than at the top of the content.
2091       *
2092       * @return bool
2093       */
2094      public function include_region_main_settings_in_header_actions() : bool {
2095          return $this->_regionmainsettingsinheader;
2096      }
2097  }