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Developer Documentation
- Bug fixes for general core bugs in 3.10.x will end 8 November 2021 (12 months).
- Bug fixes for security issues in 3.10.x will end 9 May 2022 (18 months).
- PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
/question/type/numerical/ -> questiontype.php (source)
Differences Between: [Versions 310 and 311] [Versions 310 and 400] [Versions 310 and 401] [Versions 310 and 402] [Versions 310 and 403] [Versions 39 and 310]
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 /** 19 * Question type class for the numerical question type. 20 * 21 * @package qtype 22 * @subpackage numerical 23 * @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com} 24 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 25 */ 26 27 28 defined('MOODLE_INTERNAL') || die(); 29 30 require_once($CFG->libdir . '/questionlib.php'); 31 require_once($CFG->dirroot . '/question/type/numerical/question.php'); 32 33 34 /** 35 * The numerical question type class. 36 * 37 * This class contains some special features in order to make the 38 * question type embeddable within a multianswer (cloze) question 39 * 40 * @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com} 41 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 42 */ 43 class qtype_numerical extends question_type { 44 const UNITINPUT = 0; 45 const UNITRADIO = 1; 46 const UNITSELECT = 2; 47 48 const UNITNONE = 3; 49 const UNITGRADED = 1; 50 const UNITOPTIONAL = 0; 51 52 const UNITGRADEDOUTOFMARK = 1; 53 const UNITGRADEDOUTOFMAX = 2; 54 55 /** 56 * Validate that a string is a number formatted correctly for the current locale. 57 * @param string $x a string 58 * @return bool whether $x is a number that the numerical question type can interpret. 59 */ 60 public static function is_valid_number(string $x) : bool { 61 $ap = new qtype_numerical_answer_processor(array()); 62 list($value, $unit) = $ap->apply_units($x); 63 return !is_null($value) && !$unit; 64 } 65 66 public function get_question_options($question) { 67 global $CFG, $DB, $OUTPUT; 68 parent::get_question_options($question); 69 // Get the question answers and their respective tolerances 70 // Note: question_numerical is an extension of the answer table rather than 71 // the question table as is usually the case for qtype 72 // specific tables. 73 if (!$question->options->answers = $DB->get_records_sql( 74 "SELECT a.*, n.tolerance " . 75 "FROM {question_answers} a, " . 76 " {question_numerical} n " . 77 "WHERE a.question = ? " . 78 " AND a.id = n.answer " . 79 "ORDER BY a.id ASC", array($question->id))) { 80 echo $OUTPUT->notification('Error: Missing question answer for numerical question ' . 81 $question->id . '!'); 82 return false; 83 } 84 85 $question->hints = $DB->get_records('question_hints', 86 array('questionid' => $question->id), 'id ASC'); 87 88 $this->get_numerical_units($question); 89 // Get_numerical_options() need to know if there are units 90 // to set correctly default values. 91 $this->get_numerical_options($question); 92 93 // If units are defined we strip off the default unit from the answer, if 94 // it is present. (Required for compatibility with the old code and DB). 95 if ($defaultunit = $this->get_default_numerical_unit($question)) { 96 foreach ($question->options->answers as $key => $val) { 97 $answer = trim($val->answer); 98 $length = strlen($defaultunit->unit); 99 if ($length && substr($answer, -$length) == $defaultunit->unit) { 100 $question->options->answers[$key]->answer = 101 substr($answer, 0, strlen($answer)-$length); 102 } 103 } 104 } 105 106 return true; 107 } 108 109 public function get_numerical_units(&$question) { 110 global $DB; 111 112 if ($units = $DB->get_records('question_numerical_units', 113 array('question' => $question->id), 'id ASC')) { 114 $units = array_values($units); 115 } else { 116 $units = array(); 117 } 118 foreach ($units as $key => $unit) { 119 $units[$key]->multiplier = clean_param($unit->multiplier, PARAM_FLOAT); 120 } 121 $question->options->units = $units; 122 return true; 123 } 124 125 public function get_default_numerical_unit($question) { 126 if (isset($question->options->units[0])) { 127 foreach ($question->options->units as $unit) { 128 if (abs($unit->multiplier - 1.0) < '1.0e-' . ini_get('precision')) { 129 return $unit; 130 } 131 } 132 } 133 return false; 134 } 135 136 public function get_numerical_options($question) { 137 global $DB; 138 if (!$options = $DB->get_record('question_numerical_options', 139 array('question' => $question->id))) { 140 // Old question, set defaults. 141 $question->options->unitgradingtype = 0; 142 $question->options->unitpenalty = 0.1; 143 if ($defaultunit = $this->get_default_numerical_unit($question)) { 144 $question->options->showunits = self::UNITINPUT; 145 } else { 146 $question->options->showunits = self::UNITNONE; 147 } 148 $question->options->unitsleft = 0; 149 150 } else { 151 $question->options->unitgradingtype = $options->unitgradingtype; 152 $question->options->unitpenalty = $options->unitpenalty; 153 $question->options->showunits = $options->showunits; 154 $question->options->unitsleft = $options->unitsleft; 155 } 156 157 return true; 158 } 159 160 /** 161 * Save the units and the answers associated with this question. 162 */ 163 public function save_question_options($question) { 164 global $DB; 165 $context = $question->context; 166 167 // Get old versions of the objects. 168 $oldanswers = $DB->get_records('question_answers', 169 array('question' => $question->id), 'id ASC'); 170 $oldoptions = $DB->get_records('question_numerical', 171 array('question' => $question->id), 'answer ASC'); 172 173 // Save the units. 174 $result = $this->save_units($question); 175 if (isset($result->error)) { 176 return $result; 177 } else { 178 $units = $result->units; 179 } 180 181 // Insert all the new answers. 182 foreach ($question->answer as $key => $answerdata) { 183 // Check for, and ingore, completely blank answer from the form. 184 if (trim($answerdata) == '' && $question->fraction[$key] == 0 && 185 html_is_blank($question->feedback[$key]['text'])) { 186 continue; 187 } 188 189 // Update an existing answer if possible. 190 $answer = array_shift($oldanswers); 191 if (!$answer) { 192 $answer = new stdClass(); 193 $answer->question = $question->id; 194 $answer->answer = ''; 195 $answer->feedback = ''; 196 $answer->id = $DB->insert_record('question_answers', $answer); 197 } 198 199 if (trim($answerdata) === '*') { 200 $answer->answer = '*'; 201 } else { 202 $answer->answer = $this->apply_unit($answerdata, $units, 203 !empty($question->unitsleft)); 204 if ($answer->answer === false) { 205 $result->notice = get_string('invalidnumericanswer', 'qtype_numerical'); 206 } 207 } 208 $answer->fraction = $question->fraction[$key]; 209 $answer->feedback = $this->import_or_save_files($question->feedback[$key], 210 $context, 'question', 'answerfeedback', $answer->id); 211 $answer->feedbackformat = $question->feedback[$key]['format']; 212 $DB->update_record('question_answers', $answer); 213 214 // Set up the options object. 215 if (!$options = array_shift($oldoptions)) { 216 $options = new stdClass(); 217 } 218 $options->question = $question->id; 219 $options->answer = $answer->id; 220 if (trim($question->tolerance[$key]) == '') { 221 $options->tolerance = ''; 222 } else { 223 $options->tolerance = $this->apply_unit($question->tolerance[$key], 224 $units, !empty($question->unitsleft)); 225 if ($options->tolerance === false) { 226 $result->notice = get_string('invalidnumerictolerance', 'qtype_numerical'); 227 } 228 $options->tolerance = (string)$options->tolerance; 229 } 230 if (isset($options->id)) { 231 $DB->update_record('question_numerical', $options); 232 } else { 233 $DB->insert_record('question_numerical', $options); 234 } 235 } 236 237 // Delete any left over old answer records. 238 $fs = get_file_storage(); 239 foreach ($oldanswers as $oldanswer) { 240 $fs->delete_area_files($context->id, 'question', 'answerfeedback', $oldanswer->id); 241 $DB->delete_records('question_answers', array('id' => $oldanswer->id)); 242 } 243 foreach ($oldoptions as $oldoption) { 244 $DB->delete_records('question_numerical', array('id' => $oldoption->id)); 245 } 246 247 $result = $this->save_unit_options($question); 248 if (!empty($result->error) || !empty($result->notice)) { 249 return $result; 250 } 251 252 $this->save_hints($question); 253 254 return true; 255 } 256 257 /** 258 * The numerical options control the display and the grading of the unit 259 * part of the numerical question and related types (calculateds) 260 * Questions previous to 2.0 do not have this table as multianswer questions 261 * in all versions including 2.0. The default values are set to give the same grade 262 * as old question. 263 * 264 */ 265 public function save_unit_options($question) { 266 global $DB; 267 $result = new stdClass(); 268 269 $update = true; 270 $options = $DB->get_record('question_numerical_options', 271 array('question' => $question->id)); 272 if (!$options) { 273 $options = new stdClass(); 274 $options->question = $question->id; 275 $options->id = $DB->insert_record('question_numerical_options', $options); 276 } 277 278 if (isset($question->unitpenalty)) { 279 $options->unitpenalty = $question->unitpenalty; 280 } else { 281 // Either an old question or a close question type. 282 $options->unitpenalty = 1; 283 } 284 285 $options->unitgradingtype = 0; 286 if (isset($question->unitrole)) { 287 // Saving the editing form. 288 $options->showunits = $question->unitrole; 289 if ($question->unitrole == self::UNITGRADED) { 290 $options->unitgradingtype = $question->unitgradingtypes; 291 $options->showunits = $question->multichoicedisplay; 292 } 293 294 } else if (isset($question->showunits)) { 295 // Updated import, e.g. Moodle XML. 296 $options->showunits = $question->showunits; 297 if (isset($question->unitgradingtype)) { 298 $options->unitgradingtype = $question->unitgradingtype; 299 } 300 } else { 301 // Legacy import. 302 if ($defaultunit = $this->get_default_numerical_unit($question)) { 303 $options->showunits = self::UNITINPUT; 304 } else { 305 $options->showunits = self::UNITNONE; 306 } 307 } 308 309 $options->unitsleft = !empty($question->unitsleft); 310 311 $DB->update_record('question_numerical_options', $options); 312 313 // Report any problems. 314 if (!empty($result->notice)) { 315 return $result; 316 } 317 318 return true; 319 } 320 321 public function save_units($question) { 322 global $DB; 323 $result = new stdClass(); 324 325 // Delete the units previously saved for this question. 326 $DB->delete_records('question_numerical_units', array('question' => $question->id)); 327 328 // Nothing to do. 329 if (!isset($question->multiplier)) { 330 $result->units = array(); 331 return $result; 332 } 333 334 // Save the new units. 335 $units = array(); 336 $unitalreadyinsert = array(); 337 foreach ($question->multiplier as $i => $multiplier) { 338 // Discard any unit which doesn't specify the unit or the multiplier. 339 if (!empty($question->multiplier[$i]) && !empty($question->unit[$i]) && 340 !array_key_exists($question->unit[$i], $unitalreadyinsert)) { 341 $unitalreadyinsert[$question->unit[$i]] = 1; 342 $units[$i] = new stdClass(); 343 $units[$i]->question = $question->id; 344 $units[$i]->multiplier = $this->apply_unit($question->multiplier[$i], 345 array(), false); 346 $units[$i]->unit = $question->unit[$i]; 347 $DB->insert_record('question_numerical_units', $units[$i]); 348 } 349 } 350 unset($question->multiplier, $question->unit); 351 352 $result->units = &$units; 353 return $result; 354 } 355 356 protected function initialise_question_instance(question_definition $question, $questiondata) { 357 parent::initialise_question_instance($question, $questiondata); 358 $this->initialise_numerical_answers($question, $questiondata); 359 $question->unitdisplay = $questiondata->options->showunits; 360 $question->unitgradingtype = $questiondata->options->unitgradingtype; 361 $question->unitpenalty = $questiondata->options->unitpenalty; 362 $question->unitsleft = $questiondata->options->unitsleft; 363 $question->ap = $this->make_answer_processor($questiondata->options->units, 364 $questiondata->options->unitsleft); 365 } 366 367 public function initialise_numerical_answers(question_definition $question, $questiondata) { 368 $question->answers = array(); 369 if (empty($questiondata->options->answers)) { 370 return; 371 } 372 foreach ($questiondata->options->answers as $a) { 373 $question->answers[$a->id] = new qtype_numerical_answer($a->id, $a->answer, 374 $a->fraction, $a->feedback, $a->feedbackformat, $a->tolerance); 375 } 376 } 377 378 public function make_answer_processor($units, $unitsleft) { 379 if (empty($units)) { 380 return new qtype_numerical_answer_processor(array()); 381 } 382 383 $cleanedunits = array(); 384 foreach ($units as $unit) { 385 $cleanedunits[$unit->unit] = $unit->multiplier; 386 } 387 388 return new qtype_numerical_answer_processor($cleanedunits, $unitsleft); 389 } 390 391 public function delete_question($questionid, $contextid) { 392 global $DB; 393 $DB->delete_records('question_numerical', array('question' => $questionid)); 394 $DB->delete_records('question_numerical_options', array('question' => $questionid)); 395 $DB->delete_records('question_numerical_units', array('question' => $questionid)); 396 397 parent::delete_question($questionid, $contextid); 398 } 399 400 public function get_random_guess_score($questiondata) { 401 foreach ($questiondata->options->answers as $aid => $answer) { 402 if ('*' == trim($answer->answer)) { 403 return max($answer->fraction - $questiondata->options->unitpenalty, 0); 404 } 405 } 406 return 0; 407 } 408 409 /** 410 * Add a unit to a response for display. 411 * @param object $questiondata the data defining the quetsion. 412 * @param string $answer a response. 413 * @param object $unit a unit. If null, {@link get_default_numerical_unit()} 414 * is used. 415 */ 416 public function add_unit($questiondata, $answer, $unit = null) { 417 if (is_null($unit)) { 418 $unit = $this->get_default_numerical_unit($questiondata); 419 } 420 421 if (!$unit) { 422 return $answer; 423 } 424 425 if (!empty($questiondata->options->unitsleft)) { 426 return $unit->unit . ' ' . $answer; 427 } else { 428 return $answer . ' ' . $unit->unit; 429 } 430 } 431 432 public function get_possible_responses($questiondata) { 433 $responses = array(); 434 435 $unit = $this->get_default_numerical_unit($questiondata); 436 437 $starfound = false; 438 foreach ($questiondata->options->answers as $aid => $answer) { 439 $responseclass = $answer->answer; 440 441 if ($responseclass === '*') { 442 $starfound = true; 443 } else { 444 $responseclass = $this->add_unit($questiondata, $responseclass, $unit); 445 446 $ans = new qtype_numerical_answer($answer->id, $answer->answer, $answer->fraction, 447 $answer->feedback, $answer->feedbackformat, $answer->tolerance); 448 list($min, $max) = $ans->get_tolerance_interval(); 449 $responseclass .= " ({$min}..{$max})"; 450 } 451 452 $responses[$aid] = new question_possible_response($responseclass, 453 $answer->fraction); 454 } 455 456 if (!$starfound) { 457 $responses[0] = new question_possible_response( 458 get_string('didnotmatchanyanswer', 'question'), 0); 459 } 460 461 $responses[null] = question_possible_response::no_response(); 462 463 return array($questiondata->id => $responses); 464 } 465 466 /** 467 * Checks if the $rawresponse has a unit and applys it if appropriate. 468 * 469 * @param string $rawresponse The response string to be converted to a float. 470 * @param array $units An array with the defined units, where the 471 * unit is the key and the multiplier the value. 472 * @return float The rawresponse with the unit taken into 473 * account as a float. 474 */ 475 public function apply_unit($rawresponse, $units, $unitsleft) { 476 $ap = $this->make_answer_processor($units, $unitsleft); 477 list($value, $unit, $multiplier) = $ap->apply_units($rawresponse); 478 if (!is_null($multiplier)) { 479 $value *= $multiplier; 480 } 481 return $value; 482 } 483 484 public function move_files($questionid, $oldcontextid, $newcontextid) { 485 $fs = get_file_storage(); 486 487 parent::move_files($questionid, $oldcontextid, $newcontextid); 488 $this->move_files_in_answers($questionid, $oldcontextid, $newcontextid); 489 $this->move_files_in_hints($questionid, $oldcontextid, $newcontextid); 490 } 491 492 protected function delete_files($questionid, $contextid) { 493 $fs = get_file_storage(); 494 495 parent::delete_files($questionid, $contextid); 496 $this->delete_files_in_answers($questionid, $contextid); 497 $this->delete_files_in_hints($questionid, $contextid); 498 } 499 } 500 501 502 /** 503 * This class processes numbers with units. 504 * 505 * @copyright 2010 The Open University 506 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 507 */ 508 class qtype_numerical_answer_processor { 509 /** @var array unit name => multiplier. */ 510 protected $units; 511 /** @var string character used as decimal point. */ 512 protected $decsep; 513 /** @var string character used as thousands separator. */ 514 protected $thousandssep; 515 /** @var boolean whether the units come before or after the number. */ 516 protected $unitsbefore; 517 518 protected $regex = null; 519 520 public function __construct($units, $unitsbefore = false, $decsep = null, 521 $thousandssep = null) { 522 if (is_null($decsep)) { 523 $decsep = get_string('decsep', 'langconfig'); 524 } 525 $this->decsep = $decsep; 526 527 if (is_null($thousandssep)) { 528 $thousandssep = get_string('thousandssep', 'langconfig'); 529 } 530 $this->thousandssep = $thousandssep; 531 532 $this->units = $units; 533 $this->unitsbefore = $unitsbefore; 534 } 535 536 /** 537 * Set the decimal point and thousands separator character that should be used. 538 * @param string $decsep 539 * @param string $thousandssep 540 */ 541 public function set_characters($decsep, $thousandssep) { 542 $this->decsep = $decsep; 543 $this->thousandssep = $thousandssep; 544 $this->regex = null; 545 } 546 547 /** @return string the decimal point character used. */ 548 public function get_point() { 549 return $this->decsep; 550 } 551 552 /** @return string the thousands separator character used. */ 553 public function get_separator() { 554 return $this->thousandssep; 555 } 556 557 /** 558 * @return bool If the student's response contains a '.' or a ',' that 559 * matches the thousands separator in the current locale. In this case, the 560 * parsing in apply_unit can give a result that the student did not expect. 561 */ 562 public function contains_thousands_seaparator($value) { 563 if (!in_array($this->thousandssep, array('.', ','))) { 564 return false; 565 } 566 567 return strpos($value, $this->thousandssep) !== false; 568 } 569 570 /** 571 * Create the regular expression that {@link parse_response()} requires. 572 * @return string 573 */ 574 protected function build_regex() { 575 if (!is_null($this->regex)) { 576 return $this->regex; 577 } 578 579 $decsep = preg_quote($this->decsep, '/'); 580 $thousandssep = preg_quote($this->thousandssep, '/'); 581 $beforepointre = '([+-]?[' . $thousandssep . '\d]*)'; 582 $decimalsre = $decsep . '(\d*)'; 583 $exponentre = '(?:e|E|(?:x|\*|×)10(?:\^|\*\*))([+-]?\d+)'; 584 585 $numberbit = "{$beforepointre}(?:{$decimalsre})?(?:{$exponentre})?"; 586 587 if ($this->unitsbefore) { 588 $this->regex = "/{$numberbit}$/"; 589 } else { 590 $this->regex = "/^{$numberbit}/"; 591 } 592 return $this->regex; 593 } 594 595 /** 596 * This method can be used for more locale-strict parsing of repsonses. At the 597 * moment we don't use it, and instead use the more lax parsing in apply_units. 598 * This is just a note that this funciton was used in the past, so if you are 599 * intersted, look through version control history. 600 * 601 * Take a string which is a number with or without a decimal point and exponent, 602 * and possibly followed by one of the units, and split it into bits. 603 * @param string $response a value, optionally with a unit. 604 * @return array four strings (some of which may be blank) the digits before 605 * and after the decimal point, the exponent, and the unit. All four will be 606 * null if the response cannot be parsed. 607 */ 608 protected function parse_response($response) { 609 if (!preg_match($this->build_regex(), $response, $matches)) { 610 return array(null, null, null, null); 611 } 612 613 $matches += array('', '', '', ''); // Fill in any missing matches. 614 list($matchedpart, $beforepoint, $decimals, $exponent) = $matches; 615 616 // Strip out thousands separators. 617 $beforepoint = str_replace($this->thousandssep, '', $beforepoint); 618 619 // Must be either something before, or something after the decimal point. 620 // (The only way to do this in the regex would make it much more complicated.) 621 if ($beforepoint === '' && $decimals === '') { 622 return array(null, null, null, null); 623 } 624 625 if ($this->unitsbefore) { 626 $unit = substr($response, 0, -strlen($matchedpart)); 627 } else { 628 $unit = substr($response, strlen($matchedpart)); 629 } 630 $unit = trim($unit); 631 632 return array($beforepoint, $decimals, $exponent, $unit); 633 } 634 635 /** 636 * Takes a number in almost any localised form, and possibly with a unit 637 * after it. It separates off the unit, if present, and converts to the 638 * default unit, by using the given unit multiplier. 639 * 640 * @param string $response a value, optionally with a unit. 641 * @return array(numeric, sting) the value with the unit stripped, and normalised 642 * by the unit multiplier, if any, and the unit string, for reference. 643 */ 644 public function apply_units($response, $separateunit = null) { 645 // Strip spaces (which may be thousands separators) and change other forms 646 // of writing e to e. 647 $response = str_replace(' ', '', $response); 648 $response = preg_replace('~(?:e|E|(?:x|\*|×)10(?:\^|\*\*))([+-]?\d+)~', 'e$1', $response); 649 650 // If a . is present or there are multiple , (i.e. 2,456,789 ) assume , 651 // is a thouseands separator, and strip it, else assume it is a decimal 652 // separator, and change it to .. 653 if (strpos($response, '.') !== false || substr_count($response, ',') > 1) { 654 $response = str_replace(',', '', $response); 655 } else { 656 $response = str_replace([$this->thousandssep, $this->decsep, ','], ['', '.', '.'], $response); 657 } 658 659 $regex = '[+-]?(?:\d+(?:\\.\d*)?|\\.\d+)(?:e[-+]?\d+)?'; 660 if ($this->unitsbefore) { 661 $regex = "/{$regex}$/"; 662 } else { 663 $regex = "/^{$regex}/"; 664 } 665 if (!preg_match($regex, $response, $matches)) { 666 return array(null, null, null); 667 } 668 669 $numberstring = $matches[0]; 670 if ($this->unitsbefore) { 671 // Substr returns false when it means '', so cast back to string. 672 $unit = (string) substr($response, 0, -strlen($numberstring)); 673 } else { 674 $unit = (string) substr($response, strlen($numberstring)); 675 } 676 677 if (!is_null($separateunit)) { 678 $unit = $separateunit; 679 } 680 681 if ($this->is_known_unit($unit)) { 682 $multiplier = 1 / $this->units[$unit]; 683 } else { 684 $multiplier = null; 685 } 686 687 return array($numberstring + 0, $unit, $multiplier); // The + 0 is to convert to number. 688 } 689 690 /** 691 * @return string the default unit. 692 */ 693 public function get_default_unit() { 694 reset($this->units); 695 return key($this->units); 696 } 697 698 /** 699 * @param string $answer a response. 700 * @param string $unit a unit. 701 */ 702 public function add_unit($answer, $unit = null) { 703 if (is_null($unit)) { 704 $unit = $this->get_default_unit(); 705 } 706 707 if (!$unit) { 708 return $answer; 709 } 710 711 if ($this->unitsbefore) { 712 return $unit . ' ' . $answer; 713 } else { 714 return $answer . ' ' . $unit; 715 } 716 } 717 718 /** 719 * Is this unit recognised. 720 * @param string $unit the unit 721 * @return bool whether this is a unit we recognise. 722 */ 723 public function is_known_unit($unit) { 724 return array_key_exists($unit, $this->units); 725 } 726 727 /** 728 * Whether the units go before or after the number. 729 * @return true = before, false = after. 730 */ 731 public function are_units_before() { 732 return $this->unitsbefore; 733 } 734 735 /** 736 * Get the units as an array suitably for passing to html_writer::select. 737 * @return array of unit choices. 738 */ 739 public function get_unit_options() { 740 $options = array(); 741 foreach ($this->units as $unit => $notused) { 742 $options[$unit] = $unit; 743 } 744 return $options; 745 } 746 }
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