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- Bug fixes for general core bugs in 4.2.x will end 22 April 2024 (12 months).
- Bug fixes for security issues in 4.2.x will end 7 October 2024 (18 months).
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/calendar/classes/ -> rrule_manager.php (source)
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 * Defines calendar class to manage recurrence rule (rrule) during ical imports. 19 * 20 * @package core_calendar 21 * @copyright 2014 onwards Ankit Agarwal 22 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 23 */ 24 25 namespace core_calendar; 26 27 use calendar_event; 28 use DateInterval; 29 use DateTime; 30 use moodle_exception; 31 use stdClass; 32 33 defined('MOODLE_INTERNAL') || die(); 34 require_once($CFG->dirroot . '/calendar/lib.php'); 35 36 /** 37 * Defines calendar class to manage recurrence rule (rrule) during ical imports. 38 * 39 * Please refer to RFC 2445 {@link http://www.ietf.org/rfc/rfc2445.txt} for detail explanation of the logic. 40 * Here is a basic extract from it to explain various params:- 41 * recur = "FREQ"=freq *( 42 * ; either UNTIL or COUNT may appear in a 'recur', 43 * ; but UNTIL and COUNT MUST NOT occur in the same 'recur' 44 * ( ";" "UNTIL" "=" enddate ) / 45 * ( ";" "COUNT" "=" 1*DIGIT ) / 46 * ; the rest of these keywords are optional, 47 * ; but MUST NOT occur more than once 48 * ( ";" "INTERVAL" "=" 1*DIGIT ) / 49 * ( ";" "BYSECOND" "=" byseclist ) / 50 * ( ";" "BYMINUTE" "=" byminlist ) / 51 * ( ";" "BYHOUR" "=" byhrlist ) / 52 * ( ";" "BYDAY" "=" bywdaylist ) / 53 * ( ";" "BYMONTHDAY" "=" bymodaylist ) / 54 * ( ";" "BYYEARDAY" "=" byyrdaylist ) / 55 * ( ";" "BYWEEKNO" "=" bywknolist ) / 56 * ( ";" "BYMONTH" "=" bymolist ) / 57 * ( ";" "BYSETPOS" "=" bysplist ) / 58 * ( ";" "WKST" "=" weekday ) / 59 * ( ";" x-name "=" text ) 60 * ) 61 * 62 * freq = "SECONDLY" / "MINUTELY" / "HOURLY" / "DAILY" 63 * / "WEEKLY" / "MONTHLY" / "YEARLY" 64 * enddate = date 65 * enddate =/ date-time ;An UTC value 66 * byseclist = seconds / ( seconds *("," seconds) ) 67 * seconds = 1DIGIT / 2DIGIT ;0 to 59 68 * byminlist = minutes / ( minutes *("," minutes) ) 69 * minutes = 1DIGIT / 2DIGIT ;0 to 59 70 * byhrlist = hour / ( hour *("," hour) ) 71 * hour = 1DIGIT / 2DIGIT ;0 to 23 72 * bywdaylist = weekdaynum / ( weekdaynum *("," weekdaynum) ) 73 * weekdaynum = [([plus] ordwk / minus ordwk)] weekday 74 * plus = "+" 75 * minus = "-" 76 * ordwk = 1DIGIT / 2DIGIT ;1 to 53 77 * weekday = "SU" / "MO" / "TU" / "WE" / "TH" / "FR" / "SA" 78 * ;Corresponding to SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, 79 * ;FRIDAY, SATURDAY and SUNDAY days of the week. 80 * bymodaylist = monthdaynum / ( monthdaynum *("," monthdaynum) ) 81 * monthdaynum = ([plus] ordmoday) / (minus ordmoday) 82 * ordmoday = 1DIGIT / 2DIGIT ;1 to 31 83 * byyrdaylist = yeardaynum / ( yeardaynum *("," yeardaynum) ) 84 * yeardaynum = ([plus] ordyrday) / (minus ordyrday) 85 * ordyrday = 1DIGIT / 2DIGIT / 3DIGIT ;1 to 366 86 * bywknolist = weeknum / ( weeknum *("," weeknum) ) 87 * weeknum = ([plus] ordwk) / (minus ordwk) 88 * bymolist = monthnum / ( monthnum *("," monthnum) ) 89 * monthnum = 1DIGIT / 2DIGIT ;1 to 12 90 * bysplist = setposday / ( setposday *("," setposday) ) 91 * setposday = yeardaynum 92 * 93 * @package core_calendar 94 * @copyright 2014 onwards Ankit Agarwal <ankit.agrr@gmail.com> 95 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 96 */ 97 class rrule_manager { 98 99 /** const string Frequency constant */ 100 const FREQ_YEARLY = 'yearly'; 101 102 /** const string Frequency constant */ 103 const FREQ_MONTHLY = 'monthly'; 104 105 /** const string Frequency constant */ 106 const FREQ_WEEKLY = 'weekly'; 107 108 /** const string Frequency constant */ 109 const FREQ_DAILY = 'daily'; 110 111 /** const string Frequency constant */ 112 const FREQ_HOURLY = 'hourly'; 113 114 /** const string Frequency constant */ 115 const FREQ_MINUTELY = 'everyminute'; 116 117 /** const string Frequency constant */ 118 const FREQ_SECONDLY = 'everysecond'; 119 120 /** const string Day constant */ 121 const DAY_MONDAY = 'Monday'; 122 123 /** const string Day constant */ 124 const DAY_TUESDAY = 'Tuesday'; 125 126 /** const string Day constant */ 127 const DAY_WEDNESDAY = 'Wednesday'; 128 129 /** const string Day constant */ 130 const DAY_THURSDAY = 'Thursday'; 131 132 /** const string Day constant */ 133 const DAY_FRIDAY = 'Friday'; 134 135 /** const string Day constant */ 136 const DAY_SATURDAY = 'Saturday'; 137 138 /** const string Day constant */ 139 const DAY_SUNDAY = 'Sunday'; 140 141 /** const int For forever repeating events, repeat for this many years */ 142 const TIME_UNLIMITED_YEARS = 10; 143 144 /** const array Array of days in a week. */ 145 const DAYS_OF_WEEK = [ 146 'MO' => self::DAY_MONDAY, 147 'TU' => self::DAY_TUESDAY, 148 'WE' => self::DAY_WEDNESDAY, 149 'TH' => self::DAY_THURSDAY, 150 'FR' => self::DAY_FRIDAY, 151 'SA' => self::DAY_SATURDAY, 152 'SU' => self::DAY_SUNDAY, 153 ]; 154 155 /** @var string string representing the recurrence rule */ 156 protected $rrule; 157 158 /** @var string Frequency of event */ 159 protected $freq; 160 161 /** @var int defines a timestamp value which bounds the recurrence rule in an inclusive manner.*/ 162 protected $until = 0; 163 164 /** @var int Defines the number of occurrences at which to range-bound the recurrence */ 165 protected $count = 0; 166 167 /** @var int This rule part contains a positive integer representing how often the recurrence rule repeats */ 168 protected $interval = 1; 169 170 /** @var array List of second rules */ 171 protected $bysecond = array(); 172 173 /** @var array List of Minute rules */ 174 protected $byminute = array(); 175 176 /** @var array List of hour rules */ 177 protected $byhour = array(); 178 179 /** @var array List of day rules */ 180 protected $byday = array(); 181 182 /** @var array List of monthday rules */ 183 protected $bymonthday = array(); 184 185 /** @var array List of yearday rules */ 186 protected $byyearday = array(); 187 188 /** @var array List of weekno rules */ 189 protected $byweekno = array(); 190 191 /** @var array List of month rules */ 192 protected $bymonth = array(); 193 194 /** @var array List of setpos rules */ 195 protected $bysetpos = array(); 196 197 /** @var string Week start rule. Default is Monday. */ 198 protected $wkst = self::DAY_MONDAY; 199 200 /** 201 * Constructor for the class 202 * 203 * @param string $rrule Recurrence rule 204 */ 205 public function __construct($rrule) { 206 $this->rrule = $rrule; 207 } 208 209 /** 210 * Parse the recurrence rule and setup all properties. 211 */ 212 public function parse_rrule() { 213 $rules = explode(';', $this->rrule); 214 if (empty($rules)) { 215 return; 216 } 217 foreach ($rules as $rule) { 218 $this->parse_rrule_property($rule); 219 } 220 // Validate the rules as a whole. 221 $this->validate_rules(); 222 } 223 224 /** 225 * Create events for specified rrule. 226 * 227 * @param calendar_event $passedevent Properties of event to create. 228 * @throws moodle_exception 229 */ 230 public function create_events($passedevent) { 231 global $DB; 232 233 $event = clone($passedevent); 234 // If Frequency is not set, there is nothing to do. 235 if (empty($this->freq)) { 236 return; 237 } 238 239 // Delete all child events in case of an update. This should be faster than verifying if the event exists and updating it. 240 $where = "repeatid = ? AND id != ?"; 241 $DB->delete_records_select('event', $where, array($event->id, $event->id)); 242 $eventrec = $event->properties(); 243 244 // Generate timestamps that obey the rrule. 245 $eventtimes = $this->generate_recurring_event_times($eventrec); 246 247 // Update the parent event. Make sure that its repeat ID is the same as its ID. 248 $calevent = new calendar_event($eventrec); 249 $updatedata = new stdClass(); 250 $updatedata->repeatid = $event->id; 251 // Also, adjust the parent event's timestart, if necessary. 252 if (count($eventtimes) > 0 && !in_array($eventrec->timestart, $eventtimes)) { 253 $updatedata->timestart = reset($eventtimes); 254 } 255 $calevent->update($updatedata, false); 256 $eventrec->timestart = $calevent->timestart; 257 258 // Create the recurring calendar events. 259 $this->create_recurring_events($eventrec, $eventtimes); 260 } 261 262 /** 263 * Parse a property of the recurrence rule. 264 * 265 * @param string $prop property string with type-value pair 266 * @throws moodle_exception 267 */ 268 protected function parse_rrule_property($prop) { 269 list($property, $value) = explode('=', $prop); 270 switch ($property) { 271 case 'FREQ' : 272 $this->set_frequency($value); 273 break; 274 case 'UNTIL' : 275 $this->set_until($value); 276 break; 277 CASE 'COUNT' : 278 $this->set_count($value); 279 break; 280 CASE 'INTERVAL' : 281 $this->set_interval($value); 282 break; 283 CASE 'BYSECOND' : 284 $this->set_bysecond($value); 285 break; 286 CASE 'BYMINUTE' : 287 $this->set_byminute($value); 288 break; 289 CASE 'BYHOUR' : 290 $this->set_byhour($value); 291 break; 292 CASE 'BYDAY' : 293 $this->set_byday($value); 294 break; 295 CASE 'BYMONTHDAY' : 296 $this->set_bymonthday($value); 297 break; 298 CASE 'BYYEARDAY' : 299 $this->set_byyearday($value); 300 break; 301 CASE 'BYWEEKNO' : 302 $this->set_byweekno($value); 303 break; 304 CASE 'BYMONTH' : 305 $this->set_bymonth($value); 306 break; 307 CASE 'BYSETPOS' : 308 $this->set_bysetpos($value); 309 break; 310 CASE 'WKST' : 311 $this->wkst = $this->get_day($value); 312 break; 313 default: 314 // We should never get here, something is very wrong. 315 throw new moodle_exception('errorrrule', 'calendar'); 316 } 317 } 318 319 /** 320 * Sets Frequency property. 321 * 322 * @param string $freq Frequency of event 323 * @throws moodle_exception 324 */ 325 protected function set_frequency($freq) { 326 switch ($freq) { 327 case 'YEARLY': 328 $this->freq = self::FREQ_YEARLY; 329 break; 330 case 'MONTHLY': 331 $this->freq = self::FREQ_MONTHLY; 332 break; 333 case 'WEEKLY': 334 $this->freq = self::FREQ_WEEKLY; 335 break; 336 case 'DAILY': 337 $this->freq = self::FREQ_DAILY; 338 break; 339 case 'HOURLY': 340 $this->freq = self::FREQ_HOURLY; 341 break; 342 case 'MINUTELY': 343 $this->freq = self::FREQ_MINUTELY; 344 break; 345 case 'SECONDLY': 346 $this->freq = self::FREQ_SECONDLY; 347 break; 348 default: 349 // We should never get here, something is very wrong. 350 throw new moodle_exception('errorrrulefreq', 'calendar'); 351 } 352 } 353 354 /** 355 * Gets the day from day string. 356 * 357 * @param string $daystring Day string (MO, TU, etc) 358 * @throws moodle_exception 359 * 360 * @return string Day represented by the parameter. 361 */ 362 protected function get_day($daystring) { 363 switch ($daystring) { 364 case 'MO': 365 return self::DAY_MONDAY; 366 break; 367 case 'TU': 368 return self::DAY_TUESDAY; 369 break; 370 case 'WE': 371 return self::DAY_WEDNESDAY; 372 break; 373 case 'TH': 374 return self::DAY_THURSDAY; 375 break; 376 case 'FR': 377 return self::DAY_FRIDAY; 378 break; 379 case 'SA': 380 return self::DAY_SATURDAY; 381 break; 382 case 'SU': 383 return self::DAY_SUNDAY; 384 break; 385 default: 386 // We should never get here, something is very wrong. 387 throw new moodle_exception('errorrruleday', 'calendar'); 388 } 389 } 390 391 /** 392 * Sets the UNTIL rule. 393 * 394 * @param string $until The date string representation of the UNTIL rule. 395 * @throws moodle_exception 396 */ 397 protected function set_until($until) { 398 $this->until = strtotime($until); 399 } 400 401 /** 402 * Sets the COUNT rule. 403 * 404 * @param string $count The count value. 405 * @throws moodle_exception 406 */ 407 protected function set_count($count) { 408 $this->count = intval($count); 409 } 410 411 /** 412 * Sets the INTERVAL rule. 413 * 414 * The INTERVAL rule part contains a positive integer representing how often the recurrence rule repeats. 415 * The default value is "1", meaning: 416 * - every second for a SECONDLY rule, or 417 * - every minute for a MINUTELY rule, 418 * - every hour for an HOURLY rule, 419 * - every day for a DAILY rule, 420 * - every week for a WEEKLY rule, 421 * - every month for a MONTHLY rule and 422 * - every year for a YEARLY rule. 423 * 424 * @param string $intervalstr The value for the interval rule. 425 * @throws moodle_exception 426 */ 427 protected function set_interval($intervalstr) { 428 $interval = intval($intervalstr); 429 if ($interval < 1) { 430 throw new moodle_exception('errorinvalidinterval', 'calendar'); 431 } 432 $this->interval = $interval; 433 } 434 435 /** 436 * Sets the BYSECOND rule. 437 * 438 * The BYSECOND rule part specifies a comma-separated list of seconds within a minute. 439 * Valid values are 0 to 59. 440 * 441 * @param string $bysecond Comma-separated list of seconds within a minute. 442 * @throws moodle_exception 443 */ 444 protected function set_bysecond($bysecond) { 445 $seconds = explode(',', $bysecond); 446 $bysecondrules = []; 447 foreach ($seconds as $second) { 448 if ($second < 0 || $second > 59) { 449 throw new moodle_exception('errorinvalidbysecond', 'calendar'); 450 } 451 $bysecondrules[] = (int)$second; 452 } 453 $this->bysecond = $bysecondrules; 454 } 455 456 /** 457 * Sets the BYMINUTE rule. 458 * 459 * The BYMINUTE rule part specifies a comma-separated list of seconds within an hour. 460 * Valid values are 0 to 59. 461 * 462 * @param string $byminute Comma-separated list of minutes within an hour. 463 * @throws moodle_exception 464 */ 465 protected function set_byminute($byminute) { 466 $minutes = explode(',', $byminute); 467 $byminuterules = []; 468 foreach ($minutes as $minute) { 469 if ($minute < 0 || $minute > 59) { 470 throw new moodle_exception('errorinvalidbyminute', 'calendar'); 471 } 472 $byminuterules[] = (int)$minute; 473 } 474 $this->byminute = $byminuterules; 475 } 476 477 /** 478 * Sets the BYHOUR rule. 479 * 480 * The BYHOUR rule part specifies a comma-separated list of hours of the day. 481 * Valid values are 0 to 23. 482 * 483 * @param string $byhour Comma-separated list of hours of the day. 484 * @throws moodle_exception 485 */ 486 protected function set_byhour($byhour) { 487 $hours = explode(',', $byhour); 488 $byhourrules = []; 489 foreach ($hours as $hour) { 490 if ($hour < 0 || $hour > 23) { 491 throw new moodle_exception('errorinvalidbyhour', 'calendar'); 492 } 493 $byhourrules[] = (int)$hour; 494 } 495 $this->byhour = $byhourrules; 496 } 497 498 /** 499 * Sets the BYDAY rule. 500 * 501 * The BYDAY rule part specifies a comma-separated list of days of the week; 502 * - MO indicates Monday; 503 * - TU indicates Tuesday; 504 * - WE indicates Wednesday; 505 * - TH indicates Thursday; 506 * - FR indicates Friday; 507 * - SA indicates Saturday; 508 * - SU indicates Sunday. 509 * 510 * Each BYDAY value can also be preceded by a positive (+n) or negative (-n) integer. 511 * If present, this indicates the nth occurrence of the specific day within the MONTHLY or YEARLY RRULE. 512 * For example, within a MONTHLY rule, +1MO (or simply 1MO) represents the first Monday within the month, 513 * whereas -1MO represents the last Monday of the month. 514 * If an integer modifier is not present, it means all days of this type within the specified frequency. 515 * For example, within a MONTHLY rule, MO represents all Mondays within the month. 516 * 517 * @param string $byday Comma-separated list of days of the week. 518 * @throws moodle_exception 519 */ 520 protected function set_byday($byday) { 521 $weekdays = array_keys(self::DAYS_OF_WEEK); 522 $days = explode(',', $byday); 523 $bydayrules = []; 524 foreach ($days as $day) { 525 $suffix = substr($day, -2); 526 if (!in_array($suffix, $weekdays)) { 527 throw new moodle_exception('errorinvalidbydaysuffix', 'calendar'); 528 } 529 530 $bydayrule = new stdClass(); 531 $bydayrule->day = substr($suffix, -2); 532 $bydayrule->value = (int)str_replace($suffix, '', $day); 533 534 $bydayrules[] = $bydayrule; 535 } 536 537 $this->byday = $bydayrules; 538 } 539 540 /** 541 * Sets the BYMONTHDAY rule. 542 * 543 * The BYMONTHDAY rule part specifies a comma-separated list of days of the month. 544 * Valid values are 1 to 31 or -31 to -1. For example, -10 represents the tenth to the last day of the month. 545 * 546 * @param string $bymonthday Comma-separated list of days of the month. 547 * @throws moodle_exception 548 */ 549 protected function set_bymonthday($bymonthday) { 550 $monthdays = explode(',', $bymonthday); 551 $bymonthdayrules = []; 552 foreach ($monthdays as $day) { 553 // Valid values are 1 to 31 or -31 to -1. 554 if ($day < -31 || $day > 31 || $day == 0) { 555 throw new moodle_exception('errorinvalidbymonthday', 'calendar'); 556 } 557 $bymonthdayrules[] = (int)$day; 558 } 559 560 // Sort these MONTHDAY rules in ascending order. 561 sort($bymonthdayrules); 562 563 $this->bymonthday = $bymonthdayrules; 564 } 565 566 /** 567 * Sets the BYYEARDAY rule. 568 * 569 * The BYYEARDAY rule part specifies a comma-separated list of days of the year. 570 * Valid values are 1 to 366 or -366 to -1. For example, -1 represents the last day of the year (December 31st) 571 * and -306 represents the 306th to the last day of the year (March 1st). 572 * 573 * @param string $byyearday Comma-separated list of days of the year. 574 * @throws moodle_exception 575 */ 576 protected function set_byyearday($byyearday) { 577 $yeardays = explode(',', $byyearday); 578 $byyeardayrules = []; 579 foreach ($yeardays as $day) { 580 // Valid values are 1 to 366 or -366 to -1. 581 if ($day < -366 || $day > 366 || $day == 0) { 582 throw new moodle_exception('errorinvalidbyyearday', 'calendar'); 583 } 584 $byyeardayrules[] = (int)$day; 585 } 586 $this->byyearday = $byyeardayrules; 587 } 588 589 /** 590 * Sets the BYWEEKNO rule. 591 * 592 * The BYWEEKNO rule part specifies a comma-separated list of ordinals specifying weeks of the year. 593 * Valid values are 1 to 53 or -53 to -1. This corresponds to weeks according to week numbering as defined in [ISO 8601]. 594 * A week is defined as a seven day period, starting on the day of the week defined to be the week start (see WKST). 595 * Week number one of the calendar year is the first week which contains at least four (4) days in that calendar year. 596 * This rule part is only valid for YEARLY rules. For example, 3 represents the third week of the year. 597 * 598 * Note: Assuming a Monday week start, week 53 can only occur when Thursday is January 1 or if it is a leap year and Wednesday 599 * is January 1. 600 * 601 * @param string $byweekno Comma-separated list of number of weeks. 602 * @throws moodle_exception 603 */ 604 protected function set_byweekno($byweekno) { 605 $weeknumbers = explode(',', $byweekno); 606 $byweeknorules = []; 607 foreach ($weeknumbers as $week) { 608 // Valid values are 1 to 53 or -53 to -1. 609 if ($week < -53 || $week > 53 || $week == 0) { 610 throw new moodle_exception('errorinvalidbyweekno', 'calendar'); 611 } 612 $byweeknorules[] = (int)$week; 613 } 614 $this->byweekno = $byweeknorules; 615 } 616 617 /** 618 * Sets the BYMONTH rule. 619 * 620 * The BYMONTH rule part specifies a comma-separated list of months of the year. 621 * Valid values are 1 to 12. 622 * 623 * @param string $bymonth Comma-separated list of months of the year. 624 * @throws moodle_exception 625 */ 626 protected function set_bymonth($bymonth) { 627 $months = explode(',', $bymonth); 628 $bymonthrules = []; 629 foreach ($months as $month) { 630 // Valid values are 1 to 12. 631 if ($month < 1 || $month > 12) { 632 throw new moodle_exception('errorinvalidbymonth', 'calendar'); 633 } 634 $bymonthrules[] = (int)$month; 635 } 636 $this->bymonth = $bymonthrules; 637 } 638 639 /** 640 * Sets the BYSETPOS rule. 641 * 642 * The BYSETPOS rule part specifies a comma-separated list of values which corresponds to the nth occurrence within the set of 643 * events specified by the rule. Valid values are 1 to 366 or -366 to -1. 644 * It MUST only be used in conjunction with another BYxxx rule part. 645 * 646 * For example "the last work day of the month" could be represented as: RRULE:FREQ=MONTHLY;BYDAY=MO,TU,WE,TH,FR;BYSETPOS=-1 647 * 648 * @param string $bysetpos Comma-separated list of values. 649 * @throws moodle_exception 650 */ 651 protected function set_bysetpos($bysetpos) { 652 $setposes = explode(',', $bysetpos); 653 $bysetposrules = []; 654 foreach ($setposes as $pos) { 655 // Valid values are 1 to 366 or -366 to -1. 656 if ($pos < -366 || $pos > 366 || $pos == 0) { 657 throw new moodle_exception('errorinvalidbysetpos', 'calendar'); 658 } 659 $bysetposrules[] = (int)$pos; 660 } 661 $this->bysetpos = $bysetposrules; 662 } 663 664 /** 665 * Validate the rules as a whole. 666 * 667 * @throws moodle_exception 668 */ 669 protected function validate_rules() { 670 // UNTIL and COUNT cannot be in the same recurrence rule. 671 if (!empty($this->until) && !empty($this->count)) { 672 throw new moodle_exception('errorhasuntilandcount', 'calendar'); 673 } 674 675 // BYSETPOS only be used in conjunction with another BYxxx rule part. 676 if (!empty($this->bysetpos) && empty($this->bymonth) && empty($this->bymonthday) && empty($this->bysecond) 677 && empty($this->byday) && empty($this->byweekno) && empty($this->byhour) && empty($this->byminute) 678 && empty($this->byyearday)) { 679 throw new moodle_exception('errormustbeusedwithotherbyrule', 'calendar'); 680 } 681 682 // Integer values preceding BYDAY rules can only be present for MONTHLY or YEARLY RRULE. 683 foreach ($this->byday as $bydayrule) { 684 if (!empty($bydayrule->value) && $this->freq != self::FREQ_MONTHLY && $this->freq != self::FREQ_YEARLY) { 685 throw new moodle_exception('errorinvalidbydayprefix', 'calendar'); 686 } 687 } 688 689 // The BYWEEKNO rule is only valid for YEARLY rules. 690 if (!empty($this->byweekno) && $this->freq != self::FREQ_YEARLY) { 691 throw new moodle_exception('errornonyearlyfreqwithbyweekno', 'calendar'); 692 } 693 } 694 695 /** 696 * Creates calendar events for the recurring events. 697 * 698 * @param stdClass $event The parent event. 699 * @param int[] $eventtimes The timestamps of the recurring events. 700 */ 701 protected function create_recurring_events($event, $eventtimes) { 702 $count = false; 703 if ($this->count) { 704 $count = $this->count; 705 } 706 707 foreach ($eventtimes as $time) { 708 // Skip if time is the same time with the parent event's timestamp. 709 if ($time == $event->timestart) { 710 continue; 711 } 712 713 // Decrement count, if set. 714 if ($count !== false) { 715 $count--; 716 if ($count == 0) { 717 break; 718 } 719 } 720 721 // Create the recurring event. 722 $cloneevent = clone($event); 723 $cloneevent->repeatid = $event->id; 724 $cloneevent->timestart = $time; 725 unset($cloneevent->id); 726 // UUID should only be set on the first instance of the recurring events. 727 unset($cloneevent->uuid); 728 calendar_event::create($cloneevent, false); 729 } 730 731 // If COUNT rule is defined and the number of the generated event times is less than the the COUNT rule, 732 // repeat the processing until the COUNT rule is satisfied. 733 if ($count !== false && $count > 0) { 734 // Set count to the remaining counts. 735 $this->count = $count; 736 // Clone the original event, but set the timestart to the last generated event time. 737 $tmpevent = clone($event); 738 $tmpevent->timestart = end($eventtimes); 739 // Generate the additional event times. 740 $additionaleventtimes = $this->generate_recurring_event_times($tmpevent); 741 // Create the additional events. 742 $this->create_recurring_events($event, $additionaleventtimes); 743 } 744 } 745 746 /** 747 * Generates recurring events based on the parent event and the RRULE set. 748 * 749 * If multiple BYxxx rule parts are specified, then after evaluating the specified FREQ and INTERVAL rule parts, 750 * the BYxxx rule parts are applied to the current set of evaluated occurrences in the following order: 751 * BYMONTH, BYWEEKNO, BYYEARDAY, BYMONTHDAY, BYDAY, BYHOUR, BYMINUTE, BYSECOND and BYSETPOS; 752 * then COUNT and UNTIL are evaluated. 753 * 754 * @param stdClass $event The event object. 755 * @return array The list of timestamps that obey the given RRULE. 756 */ 757 protected function generate_recurring_event_times($event) { 758 $interval = $this->get_interval(); 759 760 // Candidate event times. 761 $eventtimes = []; 762 763 $eventdatetime = new DateTime(date('Y-m-d H:i:s', $event->timestart)); 764 765 $until = null; 766 if (empty($this->count)) { 767 if ($this->until) { 768 $until = $this->until; 769 } else { 770 // Forever event. However, since there's no such thing as 'forever' (at least not in Moodle), 771 // we only repeat the events until 10 years from the current time. 772 $untildate = new DateTime(); 773 $foreverinterval = new DateInterval('P' . self::TIME_UNLIMITED_YEARS . 'Y'); 774 $untildate->add($foreverinterval); 775 $until = $untildate->getTimestamp(); 776 } 777 } else { 778 // If count is defined, let's define a tentative until date. We'll just trim the number of events later. 779 $untildate = clone($eventdatetime); 780 $count = $this->count; 781 while ($count >= 0) { 782 $untildate->add($interval); 783 $count--; 784 } 785 $until = $untildate->getTimestamp(); 786 } 787 788 // No filters applied. Generate recurring events right away. 789 if (!$this->has_by_rules()) { 790 // Get initial list of prospective events. 791 $tmpstart = clone($eventdatetime); 792 while ($tmpstart->getTimestamp() <= $until) { 793 $eventtimes[] = $tmpstart->getTimestamp(); 794 $tmpstart->add($interval); 795 } 796 return $eventtimes; 797 } 798 799 // Get all of potential dates covered by the periods from the event's start date until the last. 800 $dailyinterval = new DateInterval('P1D'); 801 $boundslist = $this->get_period_bounds_list($eventdatetime->getTimestamp(), $until); 802 foreach ($boundslist as $bounds) { 803 $tmpdate = new DateTime(date('Y-m-d H:i:s', $bounds->start)); 804 while ($tmpdate->getTimestamp() >= $bounds->start && $tmpdate->getTimestamp() < $bounds->next) { 805 $eventtimes[] = $tmpdate->getTimestamp(); 806 $tmpdate->add($dailyinterval); 807 } 808 } 809 810 // Evaluate BYMONTH rules. 811 $eventtimes = $this->filter_by_month($eventtimes); 812 813 // Evaluate BYWEEKNO rules. 814 $eventtimes = $this->filter_by_weekno($eventtimes); 815 816 // Evaluate BYYEARDAY rules. 817 $eventtimes = $this->filter_by_yearday($eventtimes); 818 819 // If BYYEARDAY, BYMONTHDAY and BYDAY are not set, default to BYMONTHDAY based on the DTSTART's day. 820 if ($this->freq != self::FREQ_DAILY && empty($this->byyearday) && empty($this->bymonthday) && empty($this->byday)) { 821 $this->bymonthday = [$eventdatetime->format('j')]; 822 } 823 824 // Evaluate BYMONTHDAY rules. 825 $eventtimes = $this->filter_by_monthday($eventtimes); 826 827 // Evaluate BYDAY rules. 828 $eventtimes = $this->filter_by_day($event, $eventtimes, $until); 829 830 // Evaluate BYHOUR rules. 831 $eventtimes = $this->apply_hour_minute_second_rules($eventdatetime, $eventtimes); 832 833 // Evaluate BYSETPOS rules. 834 $eventtimes = $this->filter_by_setpos($event, $eventtimes, $until); 835 836 // Sort event times in ascending order. 837 sort($eventtimes); 838 839 // Finally, filter candidate event times to make sure they are within the DTSTART and UNTIL/tentative until boundaries. 840 $results = []; 841 foreach ($eventtimes as $time) { 842 // Skip out-of-range events. 843 if ($time < $eventdatetime->getTimestamp()) { 844 continue; 845 } 846 // End if event time is beyond the until limit. 847 if ($time > $until) { 848 break; 849 } 850 $results[] = $time; 851 } 852 853 return $results; 854 } 855 856 /** 857 * Generates a DateInterval object based on the FREQ and INTERVAL rules. 858 * 859 * @return DateInterval 860 * @throws moodle_exception 861 */ 862 protected function get_interval() { 863 $intervalspec = null; 864 switch ($this->freq) { 865 case self::FREQ_YEARLY: 866 $intervalspec = 'P' . $this->interval . 'Y'; 867 break; 868 case self::FREQ_MONTHLY: 869 $intervalspec = 'P' . $this->interval . 'M'; 870 break; 871 case self::FREQ_WEEKLY: 872 $intervalspec = 'P' . $this->interval . 'W'; 873 break; 874 case self::FREQ_DAILY: 875 $intervalspec = 'P' . $this->interval . 'D'; 876 break; 877 case self::FREQ_HOURLY: 878 $intervalspec = 'PT' . $this->interval . 'H'; 879 break; 880 case self::FREQ_MINUTELY: 881 $intervalspec = 'PT' . $this->interval . 'M'; 882 break; 883 case self::FREQ_SECONDLY: 884 $intervalspec = 'PT' . $this->interval . 'S'; 885 break; 886 default: 887 // We should never get here, something is very wrong. 888 throw new moodle_exception('errorrrulefreq', 'calendar'); 889 } 890 891 return new DateInterval($intervalspec); 892 } 893 894 /** 895 * Determines whether the RRULE has BYxxx rules or not. 896 * 897 * @return bool True if there is one or more BYxxx rules to process. False, otherwise. 898 */ 899 protected function has_by_rules() { 900 return !empty($this->bymonth) || !empty($this->bymonthday) || !empty($this->bysecond) || !empty($this->byday) 901 || !empty($this->byweekno) || !empty($this->byhour) || !empty($this->byminute) || !empty($this->byyearday); 902 } 903 904 /** 905 * Filter event times based on the BYMONTH rule. 906 * 907 * @param int[] $eventdates Timestamps of event times to be filtered. 908 * @return int[] Array of filtered timestamps. 909 */ 910 protected function filter_by_month($eventdates) { 911 if (empty($this->bymonth)) { 912 return $eventdates; 913 } 914 915 $filteredbymonth = []; 916 foreach ($eventdates as $time) { 917 foreach ($this->bymonth as $month) { 918 $prospectmonth = date('n', $time); 919 if ($month == $prospectmonth) { 920 $filteredbymonth[] = $time; 921 break; 922 } 923 } 924 } 925 return $filteredbymonth; 926 } 927 928 /** 929 * Filter event times based on the BYWEEKNO rule. 930 * 931 * @param int[] $eventdates Timestamps of event times to be filtered. 932 * @return int[] Array of filtered timestamps. 933 */ 934 protected function filter_by_weekno($eventdates) { 935 if (empty($this->byweekno)) { 936 return $eventdates; 937 } 938 939 $filteredbyweekno = []; 940 $weeklyinterval = null; 941 foreach ($eventdates as $time) { 942 $tmpdate = new DateTime(date('Y-m-d H:i:s', $time)); 943 foreach ($this->byweekno as $weekno) { 944 if ($weekno > 0) { 945 if ($tmpdate->format('W') == $weekno) { 946 $filteredbyweekno[] = $time; 947 break; 948 } 949 } else if ($weekno < 0) { 950 if ($weeklyinterval === null) { 951 $weeklyinterval = new DateInterval('P1W'); 952 } 953 $weekstart = new DateTime(); 954 $weekstart->setISODate($tmpdate->format('Y'), $weekno); 955 $weeknext = clone($weekstart); 956 $weeknext->add($weeklyinterval); 957 958 $tmptimestamp = $tmpdate->getTimestamp(); 959 960 if ($tmptimestamp >= $weekstart->getTimestamp() && $tmptimestamp < $weeknext->getTimestamp()) { 961 $filteredbyweekno[] = $time; 962 break; 963 } 964 } 965 } 966 } 967 return $filteredbyweekno; 968 } 969 970 /** 971 * Filter event times based on the BYYEARDAY rule. 972 * 973 * @param int[] $eventdates Timestamps of event times to be filtered. 974 * @return int[] Array of filtered timestamps. 975 */ 976 protected function filter_by_yearday($eventdates) { 977 if (empty($this->byyearday)) { 978 return $eventdates; 979 } 980 981 $filteredbyyearday = []; 982 foreach ($eventdates as $time) { 983 $tmpdate = new DateTime(date('Y-m-d', $time)); 984 985 foreach ($this->byyearday as $yearday) { 986 $dayoffset = abs($yearday) - 1; 987 $dayoffsetinterval = new DateInterval("P{$dayoffset}D"); 988 989 if ($yearday > 0) { 990 $tmpyearday = (int)$tmpdate->format('z') + 1; 991 if ($tmpyearday == $yearday) { 992 $filteredbyyearday[] = $time; 993 break; 994 } 995 } else if ($yearday < 0) { 996 $yeardaydate = new DateTime('last day of ' . $tmpdate->format('Y')); 997 $yeardaydate->sub($dayoffsetinterval); 998 999 $tmpdate->getTimestamp(); 1000 1001 if ($yeardaydate->format('z') == $tmpdate->format('z')) { 1002 $filteredbyyearday[] = $time; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 return $filteredbyyearday; 1009 } 1010 1011 /** 1012 * Filter event times based on the BYMONTHDAY rule. 1013 * 1014 * @param int[] $eventdates The event times to be filtered. 1015 * @return int[] Array of filtered timestamps. 1016 */ 1017 protected function filter_by_monthday($eventdates) { 1018 if (empty($this->bymonthday)) { 1019 return $eventdates; 1020 } 1021 1022 $filteredbymonthday = []; 1023 foreach ($eventdates as $time) { 1024 $eventdatetime = new DateTime(date('Y-m-d', $time)); 1025 foreach ($this->bymonthday as $monthday) { 1026 // Days to add/subtract. 1027 $daysoffset = abs($monthday) - 1; 1028 $dayinterval = new DateInterval("P{$daysoffset}D"); 1029 1030 if ($monthday > 0) { 1031 if ($eventdatetime->format('j') == $monthday) { 1032 $filteredbymonthday[] = $time; 1033 break; 1034 } 1035 } else if ($monthday < 0) { 1036 $tmpdate = clone($eventdatetime); 1037 // Reset to the first day of the month. 1038 $tmpdate->modify('first day of this month'); 1039 // Then go to last day of the month. 1040 $tmpdate->modify('last day of this month'); 1041 if ($daysoffset > 0) { 1042 // Then subtract the monthday value. 1043 $tmpdate->sub($dayinterval); 1044 } 1045 if ($eventdatetime->format('j') == $tmpdate->format('j')) { 1046 $filteredbymonthday[] = $time; 1047 break; 1048 } 1049 } 1050 } 1051 } 1052 return $filteredbymonthday; 1053 } 1054 1055 /** 1056 * Filter event times based on the BYDAY rule. 1057 * 1058 * @param stdClass $event The parent event. 1059 * @param int[] $eventdates The event times to be filtered. 1060 * @param int $until Event times generation limit date. 1061 * @return int[] Array of filtered timestamps. 1062 */ 1063 protected function filter_by_day($event, $eventdates, $until) { 1064 if (empty($this->byday)) { 1065 return $eventdates; 1066 } 1067 1068 $filteredbyday = []; 1069 1070 $bounds = $this->get_period_bounds_list($event->timestart, $until); 1071 1072 $nextmonthinterval = new DateInterval('P1M'); 1073 foreach ($eventdates as $time) { 1074 $tmpdatetime = new DateTime(date('Y-m-d', $time)); 1075 1076 foreach ($this->byday as $day) { 1077 $dayname = self::DAYS_OF_WEEK[$day->day]; 1078 1079 // Skip if they day name of the event time does not match the day part of the BYDAY rule. 1080 if ($tmpdatetime->format('l') !== $dayname) { 1081 continue; 1082 } 1083 1084 if (empty($day->value)) { 1085 // No modifier value. Applies to all weekdays of the given period. 1086 $filteredbyday[] = $time; 1087 break; 1088 } else if ($day->value > 0) { 1089 // Positive value. 1090 if ($this->freq === self::FREQ_YEARLY && empty($this->bymonth)) { 1091 // Get the first day of the year. 1092 $firstdaydate = $tmpdatetime->format('Y') . '-01-01'; 1093 } else { 1094 // Get the first day of the month. 1095 $firstdaydate = $tmpdatetime->format('Y-m') . '-01'; 1096 } 1097 $expecteddate = new DateTime($firstdaydate); 1098 $count = $day->value; 1099 // Get the nth week day of the year/month. 1100 $expecteddate->modify("+$count $dayname"); 1101 if ($expecteddate->format('Y-m-d') === $tmpdatetime->format('Y-m-d')) { 1102 $filteredbyday[] = $time; 1103 break; 1104 } 1105 1106 } else { 1107 // Negative value. 1108 $count = $day->value; 1109 if ($this->freq === self::FREQ_YEARLY && empty($this->bymonth)) { 1110 // The -Nth week day of the year. 1111 $eventyear = (int)$tmpdatetime->format('Y'); 1112 // Get temporary DateTime object starting from the first day of the next year. 1113 $expecteddate = new DateTime((++$eventyear) . '-01-01'); 1114 while ($count < 0) { 1115 // Get the start of the previous week. 1116 $expecteddate->modify('last ' . $this->wkst); 1117 $tmpexpecteddate = clone($expecteddate); 1118 if ($tmpexpecteddate->format('l') !== $dayname) { 1119 $tmpexpecteddate->modify('next ' . $dayname); 1120 } 1121 if ($this->in_bounds($tmpexpecteddate->getTimestamp(), $bounds)) { 1122 $expecteddate = $tmpexpecteddate; 1123 $count++; 1124 } 1125 } 1126 if ($expecteddate->format('l') !== $dayname) { 1127 $expecteddate->modify('next ' . $dayname); 1128 } 1129 if ($expecteddate->getTimestamp() == $time) { 1130 $filteredbyday[] = $time; 1131 break; 1132 } 1133 1134 } else { 1135 // The -Nth week day of the month. 1136 $expectedmonthyear = $tmpdatetime->format('F Y'); 1137 $expecteddate = new DateTime("first day of $expectedmonthyear"); 1138 $expecteddate->add($nextmonthinterval); 1139 while ($count < 0) { 1140 // Get the start of the previous week. 1141 $expecteddate->modify('last ' . $this->wkst); 1142 $tmpexpecteddate = clone($expecteddate); 1143 if ($tmpexpecteddate->format('l') !== $dayname) { 1144 $tmpexpecteddate->modify('next ' . $dayname); 1145 } 1146 if ($this->in_bounds($tmpexpecteddate->getTimestamp(), $bounds)) { 1147 $expecteddate = $tmpexpecteddate; 1148 $count++; 1149 } 1150 } 1151 1152 // Compare the expected date with the event's timestamp. 1153 if ($expecteddate->getTimestamp() == $time) { 1154 $filteredbyday[] = $time; 1155 break; 1156 } 1157 } 1158 } 1159 } 1160 } 1161 return $filteredbyday; 1162 } 1163 1164 /** 1165 * Applies BYHOUR, BYMINUTE and BYSECOND rules to the calculated event dates. 1166 * Defaults to the DTSTART's hour/minute/second component when not defined. 1167 * 1168 * @param DateTime $eventdatetime The parent event DateTime object pertaining to the DTSTART. 1169 * @param int[] $eventdates Array of candidate event date timestamps. 1170 * @return array List of updated event timestamps that contain the time component of the event times. 1171 */ 1172 protected function apply_hour_minute_second_rules(DateTime $eventdatetime, $eventdates) { 1173 // If BYHOUR rules are not set, set the hour of the events from the DTSTART's hour component. 1174 if (empty($this->byhour)) { 1175 $this->byhour = [$eventdatetime->format('G')]; 1176 } 1177 // If BYMINUTE rules are not set, set the hour of the events from the DTSTART's minute component. 1178 if (empty($this->byminute)) { 1179 $this->byminute = [(int)$eventdatetime->format('i')]; 1180 } 1181 // If BYSECOND rules are not set, set the hour of the events from the DTSTART's second component. 1182 if (empty($this->bysecond)) { 1183 $this->bysecond = [(int)$eventdatetime->format('s')]; 1184 } 1185 1186 $results = []; 1187 foreach ($eventdates as $time) { 1188 $datetime = new DateTime(date('Y-m-d', $time)); 1189 foreach ($this->byhour as $hour) { 1190 foreach ($this->byminute as $minute) { 1191 foreach ($this->bysecond as $second) { 1192 $datetime->setTime($hour, $minute, $second); 1193 $results[] = $datetime->getTimestamp(); 1194 } 1195 } 1196 } 1197 } 1198 return $results; 1199 } 1200 1201 /** 1202 * Filter event times based on the BYSETPOS rule. 1203 * 1204 * @param stdClass $event The parent event. 1205 * @param int[] $eventtimes The event times to be filtered. 1206 * @param int $until Event times generation limit date. 1207 * @return int[] Array of filtered timestamps. 1208 */ 1209 protected function filter_by_setpos($event, $eventtimes, $until) { 1210 if (empty($this->bysetpos)) { 1211 return $eventtimes; 1212 } 1213 1214 $filteredbysetpos = []; 1215 $boundslist = $this->get_period_bounds_list($event->timestart, $until); 1216 sort($eventtimes); 1217 foreach ($boundslist as $bounds) { 1218 // Generate a list of candidate event times based that are covered in a period's bounds. 1219 $prospecttimes = []; 1220 foreach ($eventtimes as $time) { 1221 if ($time >= $bounds->start && $time < $bounds->next) { 1222 $prospecttimes[] = $time; 1223 } 1224 } 1225 if (empty($prospecttimes)) { 1226 continue; 1227 } 1228 // Add the event times that correspond to the set position rule into the filtered results. 1229 foreach ($this->bysetpos as $pos) { 1230 $tmptimes = $prospecttimes; 1231 if ($pos < 0) { 1232 rsort($tmptimes); 1233 } 1234 $index = abs($pos) - 1; 1235 if (isset($tmptimes[$index])) { 1236 $filteredbysetpos[] = $tmptimes[$index]; 1237 } 1238 } 1239 } 1240 return $filteredbysetpos; 1241 } 1242 1243 /** 1244 * Gets the list of period boundaries covered by the recurring events. 1245 * 1246 * @param int $eventtime The event timestamp. 1247 * @param int $until The end timestamp. 1248 * @return array List of period bounds, with start and next properties. 1249 */ 1250 protected function get_period_bounds_list($eventtime, $until) { 1251 $interval = $this->get_interval(); 1252 $periodbounds = $this->get_period_boundaries($eventtime); 1253 $periodstart = $periodbounds['start']; 1254 $periodafter = $periodbounds['next']; 1255 $bounds = []; 1256 if ($until !== null) { 1257 while ($periodstart->getTimestamp() < $until) { 1258 $bounds[] = (object)[ 1259 'start' => $periodstart->getTimestamp(), 1260 'next' => $periodafter->getTimestamp() 1261 ]; 1262 $periodstart->add($interval); 1263 $periodafter->add($interval); 1264 } 1265 } else { 1266 $count = $this->count; 1267 while ($count > 0) { 1268 $bounds[] = (object)[ 1269 'start' => $periodstart->getTimestamp(), 1270 'next' => $periodafter->getTimestamp() 1271 ]; 1272 $periodstart->add($interval); 1273 $periodafter->add($interval); 1274 $count--; 1275 } 1276 } 1277 1278 return $bounds; 1279 } 1280 1281 /** 1282 * Determine whether the date-time in question is within the bounds of the periods that are covered by the RRULE. 1283 * 1284 * @param int $time The timestamp to be evaluated. 1285 * @param array $bounds Array of period boundaries covered by the RRULE. 1286 * @return bool 1287 */ 1288 protected function in_bounds($time, $bounds) { 1289 foreach ($bounds as $bound) { 1290 if ($time >= $bound->start && $time < $bound->next) { 1291 return true; 1292 } 1293 } 1294 return false; 1295 } 1296 1297 /** 1298 * Determines the start and end DateTime objects that serve as references to determine whether a calculated event timestamp 1299 * falls on the period defined by these DateTimes objects. 1300 * 1301 * @param int $eventtime Unix timestamp of the event time. 1302 * @return DateTime[] 1303 * @throws moodle_exception 1304 */ 1305 protected function get_period_boundaries($eventtime) { 1306 $nextintervalspec = null; 1307 1308 switch ($this->freq) { 1309 case self::FREQ_YEARLY: 1310 $nextintervalspec = 'P1Y'; 1311 $timestart = date('Y-01-01', $eventtime); 1312 break; 1313 case self::FREQ_MONTHLY: 1314 $nextintervalspec = 'P1M'; 1315 $timestart = date('Y-m-01', $eventtime); 1316 break; 1317 case self::FREQ_WEEKLY: 1318 $nextintervalspec = 'P1W'; 1319 if (date('l', $eventtime) === $this->wkst) { 1320 $weekstarttime = $eventtime; 1321 } else { 1322 $weekstarttime = strtotime('last ' . $this->wkst, $eventtime); 1323 } 1324 $timestart = date('Y-m-d', $weekstarttime); 1325 break; 1326 case self::FREQ_DAILY: 1327 $nextintervalspec = 'P1D'; 1328 $timestart = date('Y-m-d', $eventtime); 1329 break; 1330 case self::FREQ_HOURLY: 1331 $nextintervalspec = 'PT1H'; 1332 $timestart = date('Y-m-d H:00:00', $eventtime); 1333 break; 1334 case self::FREQ_MINUTELY: 1335 $nextintervalspec = 'PT1M'; 1336 $timestart = date('Y-m-d H:i:00', $eventtime); 1337 break; 1338 case self::FREQ_SECONDLY: 1339 $nextintervalspec = 'PT1S'; 1340 $timestart = date('Y-m-d H:i:s', $eventtime); 1341 break; 1342 default: 1343 // We should never get here, something is very wrong. 1344 throw new moodle_exception('errorrrulefreq', 'calendar'); 1345 } 1346 1347 $eventstart = new DateTime($timestart); 1348 $eventnext = clone($eventstart); 1349 $nextinterval = new DateInterval($nextintervalspec); 1350 $eventnext->add($nextinterval); 1351 1352 return [ 1353 'start' => $eventstart, 1354 'next' => $eventnext, 1355 ]; 1356 } 1357 }
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