mod/quiz/mod_form.php

   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 the quiz module ettings form.
  19  *
  20  * @package    mod
  21  * @subpackage quiz
  22  * @copyright  2006 Jamie Pratt
  23  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26
  27 defined('MOODLE_INTERNAL') || die();
  28
  29 require_once($CFG->dirroot . '/course/moodleform_mod.php');
  30 require_once($CFG->dirroot . '/mod/quiz/locallib.php');
  31
  32
  33 /**
  34  * Settings form for the quiz module.
  35  *
  36  * @copyright  2006 Jamie Pratt
  37  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  38  */
  39 class mod_quiz_mod_form extends moodleform_mod {
  40     protected $_feedbacks;
  41     protected static $reviewfields = array(); // Initialised in the constructor.
  42
  43     public function __construct($current, $section, $cm, $course) {
  44         self::$reviewfields = array(
  45             'attempt' => get_string('theattempt', 'quiz'),
  46             'correctness' => get_string('whethercorrect', 'question'),
  47             'marks' => get_string('marks', 'question'),
  48             'specificfeedback' => get_string('specificfeedback', 'question'),
  49             'generalfeedback' => get_string('generalfeedback', 'question'),
  50             'rightanswer' => get_string('rightanswer', 'question'),
  51             'overallfeedback' => get_string('overallfeedback', 'quiz'),
  52         );
  53         parent::__construct($current, $section, $cm, $course);
  54     }
  55
  56     protected function definition() {
  57         global $COURSE, $CFG, $DB, $PAGE;
  58         $quizconfig = get_config('quiz');
  59         $mform = $this->_form;
  60
  61         //-------------------------------------------------------------------------------
  62         $mform->addElement('header', 'general', get_string('general', 'form'));
  63
  64         // Name.
  65         $mform->addElement('text', 'name', get_string('name'), array('size'=>'64'));
  66         if (!empty($CFG->formatstringstriptags)) {
  67             $mform->setType('name', PARAM_TEXT);
  68         } else {
  69             $mform->setType('name', PARAM_CLEANHTML);
  70         }
  71         $mform->addRule('name', null, 'required', null, 'client');
  72
  73         // Introduction.
  74         $this->add_intro_editor(false, get_string('introduction', 'quiz'));
  75
  76         // Open and close dates.
  77         $mform->addElement('date_time_selector', 'timeopen', get_string('quizopen', 'quiz'),
  78                 array('optional' => true, 'step' => 1));
  79         $mform->addHelpButton('timeopen', 'quizopenclose', 'quiz');
  80
  81         $mform->addElement('date_time_selector', 'timeclose', get_string('quizclose', 'quiz'),
  82                 array('optional' => true, 'step' => 1));
  83
  84         // Time limit.
  85         $mform->addElement('duration', 'timelimit', get_string('timelimit', 'quiz'),
  86                 array('optional' => true));
  87         $mform->addHelpButton('timelimit', 'timelimit', 'quiz');
  88         $mform->setAdvanced('timelimit', $quizconfig->timelimit_adv);
  89         $mform->setDefault('timelimit', $quizconfig->timelimit);
  90
  91         // Number of attempts.
  92         $attemptoptions = array('0' => get_string('unlimited'));
  93         for ($i = 1; $i <= QUIZ_MAX_ATTEMPT_OPTION; $i++) {
  94             $attemptoptions[$i] = $i;
  95         }
  96         $mform->addElement('select', 'attempts', get_string('attemptsallowed', 'quiz'),
  97                 $attemptoptions);
  98         $mform->setAdvanced('attempts', $quizconfig->attempts_adv);
  99         $mform->setDefault('attempts', $quizconfig->attempts);
 100
 101         // Grading method.
 102         $mform->addElement('select', 'grademethod', get_string('grademethod', 'quiz'),
 103                 quiz_get_grading_options());
 104         $mform->addHelpButton('grademethod', 'grademethod', 'quiz');
 105         $mform->setAdvanced('grademethod', $quizconfig->grademethod_adv);
 106         $mform->setDefault('grademethod', $quizconfig->grademethod);
 107         $mform->disabledIf('grademethod', 'attempts', 'eq', 1);
 108
 109         //-------------------------------------------------------------------------------
 110         // Grade settings
 111         $this->standard_grading_coursemodule_elements();
 112
 113         $mform->removeElement('grade');
 114         $mform->addElement('hidden', 'grade', $quizconfig->maximumgrade);
 115         $mform->setType('grade', PARAM_NUMBER);
 116
 117         //-------------------------------------------------------------------------------
 118         $mform->addElement('header', 'layouthdr', get_string('layout', 'quiz'));
 119
 120         // Shuffle questions.
 121         $shuffleoptions = array(
 122             0 => get_string('asshownoneditscreen', 'quiz'),
 123             1 => get_string('shuffledrandomly', 'quiz')
 124         );
 125         $mform->addElement('select', 'shufflequestions', get_string('questionorder', 'quiz'),
 126                 $shuffleoptions, array('id' => 'id_shufflequestions'));
 127         $mform->setAdvanced('shufflequestions', $quizconfig->shufflequestions_adv);
 128         $mform->setDefault('shufflequestions', $quizconfig->shufflequestions);
 129
 130         // Questions per page.
 131         $pageoptions = array();
 132         $pageoptions[0] = get_string('neverallononepage', 'quiz');
 133         $pageoptions[1] = get_string('everyquestion', 'quiz');
 134         for ($i = 2; $i <= QUIZ_MAX_QPP_OPTION; ++$i) {
 135             $pageoptions[$i] = get_string('everynquestions', 'quiz', $i);
 136         }
 137
 138         $pagegroup = array();
 139         $pagegroup[] = $mform->createElement('select', 'questionsperpage',
 140                 get_string('newpage', 'quiz'), $pageoptions, array('id' => 'id_questionsperpage'));
 141         $mform->setDefault('questionsperpage', $quizconfig->questionsperpage);
 142
 143         if (!empty($this->_cm)) {
 144             $pagegroup[] = $mform->createElement('checkbox', 'repaginatenow', '',
 145                     get_string('repaginatenow', 'quiz'), array('id' => 'id_repaginatenow'));
 146             $mform->disabledIf('repaginatenow', 'shufflequestions', 'eq', 1);
 147             $PAGE->requires->yui2_lib('event');
 148             $PAGE->requires->js('/mod/quiz/edit.js');
 149             $PAGE->requires->js_init_call('quiz_settings_init');
 150         }
 151
 152         $mform->addGroup($pagegroup, 'questionsperpagegrp',
 153                 get_string('newpage', 'quiz'), null, false);
 154         $mform->addHelpButton('questionsperpagegrp', 'newpage', 'quiz');
 155         $mform->setAdvanced('questionsperpagegrp', $quizconfig->questionsperpage_adv);
 156
 157         //-------------------------------------------------------------------------------
 158         $mform->addElement('header', 'interactionhdr', get_string('questionbehaviour', 'quiz'));
 159
 160         // Shuffle within questions.
 161         $mform->addElement('selectyesno', 'shuffleanswers', get_string('shufflewithin', 'quiz'));
 162         $mform->addHelpButton('shuffleanswers', 'shufflewithin', 'quiz');
 163         $mform->setAdvanced('shuffleanswers', $quizconfig->shuffleanswers_adv);
 164         $mform->setDefault('shuffleanswers', $quizconfig->shuffleanswers);
 165
 166         // How questions behave (question behaviour).
 167         if (!empty($this->current->preferredbehaviour)) {
 168             $currentbehaviour = $this->current->preferredbehaviour;
 169         } else {
 170             $currentbehaviour = '';
 171         }
 172         $behaviours = question_engine::get_behaviour_options($currentbehaviour);
 173         $mform->addElement('select', 'preferredbehaviour',
 174                 get_string('howquestionsbehave', 'question'), $behaviours);
 175         $mform->addHelpButton('preferredbehaviour', 'howquestionsbehave', 'question');
 176         $mform->setDefault('preferredbehaviour', $quizconfig->preferredbehaviour);
 177
 178         // Each attempt builds on last.
 179         $mform->addElement('selectyesno', 'attemptonlast',
 180                 get_string('eachattemptbuildsonthelast', 'quiz'));
 181         $mform->addHelpButton('attemptonlast', 'eachattemptbuildsonthelast', 'quiz');
 182         $mform->setAdvanced('attemptonlast', $quizconfig->attemptonlast_adv);
 183         $mform->setDefault('attemptonlast', $quizconfig->attemptonlast);
 184         $mform->disabledIf('attemptonlast', 'attempts', 'eq', 1);
 185
 186         //-------------------------------------------------------------------------------
 187         $mform->addElement('header', 'reviewoptionshdr',
 188                 get_string('reviewoptionsheading', 'quiz'));
 189         $mform->addHelpButton('reviewoptionshdr', 'reviewoptionsheading', 'quiz');
 190
 191         // Review options.
 192         $this->add_review_options_group($mform, $quizconfig, 'during',
 193                 mod_quiz_display_options::DURING);
 194         $this->add_review_options_group($mform, $quizconfig, 'immediately',
 195                 mod_quiz_display_options::IMMEDIATELY_AFTER);
 196         $this->add_review_options_group($mform, $quizconfig, 'open',
 197                 mod_quiz_display_options::LATER_WHILE_OPEN);
 198         $this->add_review_options_group($mform, $quizconfig, 'closed',
 199                 mod_quiz_display_options::AFTER_CLOSE);
 200
 201         foreach ($behaviours as $behaviour => $notused) {
 202             $unusedoptions = question_engine::get_behaviour_unused_display_options($behaviour);
 203             foreach ($unusedoptions as $unusedoption) {
 204                 $mform->disabledIf($unusedoption . 'during', 'preferredbehaviour',
 205                         'eq', $behaviour);
 206             }
 207         }
 208         $mform->disabledIf('attemptduring', 'preferredbehaviour',
 209                 'neq', 'wontmatch');
 210         $mform->disabledIf('overallfeedbackduring', 'preferredbehaviour',
 211                 'neq', 'wontmatch');
 212
 213         //-------------------------------------------------------------------------------
 214         $mform->addElement('header', 'display', get_string('display', 'form'));
 215
 216         // Show user picture.
 217         $mform->addElement('selectyesno', 'showuserpicture',
 218                 get_string('showuserpicture', 'quiz'));
 219         $mform->addHelpButton('showuserpicture', 'showuserpicture', 'quiz');
 220         $mform->setAdvanced('showuserpicture', $quizconfig->showuserpicture_adv);
 221         $mform->setDefault('showuserpicture', $quizconfig->showuserpicture);
 222
 223         // Overall decimal points.
 224         $options = array();
 225         for ($i = 0; $i <= QUIZ_MAX_DECIMAL_OPTION; $i++) {
 226             $options[$i] = $i;
 227         }
 228         $mform->addElement('select', 'decimalpoints', get_string('decimalplaces', 'quiz'),
 229                 $options);
 230         $mform->addHelpButton('decimalpoints', 'decimalplaces', 'quiz');
 231         $mform->setAdvanced('decimalpoints', $quizconfig->decimalpoints_adv);
 232         $mform->setDefault('decimalpoints', $quizconfig->decimalpoints);
 233
 234         // Question decimal points.
 235         $options = array(-1 => get_string('sameasoverall', 'quiz'));
 236         for ($i = 0; $i <= QUIZ_MAX_Q_DECIMAL_OPTION; $i++) {
 237             $options[$i] = $i;
 238         }
 239         $mform->addElement('select', 'questiondecimalpoints',
 240                 get_string('decimalplacesquestion', 'quiz'), $options);
 241         $mform->addHelpButton('questiondecimalpoints', 'decimalplacesquestion', 'quiz');
 242         $mform->setAdvanced('questiondecimalpoints', $quizconfig->questiondecimalpoints_adv);
 243         $mform->setDefault('questiondecimalpoints', $quizconfig->questiondecimalpoints);
 244
 245         // Show blocks during quiz attempt
 246         $mform->addElement('selectyesno', 'showblocks', get_string('showblocks', 'quiz'));
 247         $mform->addHelpButton('showblocks', 'showblocks', 'quiz');
 248         $mform->setAdvanced('showblocks', $quizconfig->showblocks_adv);
 249         $mform->setDefault('showblocks', $quizconfig->showblocks);
 250
 251         //-------------------------------------------------------------------------------
 252         $mform->addElement('header', 'security', get_string('extraattemptrestrictions', 'quiz'));
 253
 254         // Enforced time delay between quiz attempts.
 255         $mform->addElement('passwordunmask', 'quizpassword', get_string('requirepassword', 'quiz'));
 256         $mform->setType('quizpassword', PARAM_TEXT);
 257         $mform->addHelpButton('quizpassword', 'requirepassword', 'quiz');
 258         $mform->setAdvanced('quizpassword', $quizconfig->password_adv);
 259         $mform->setDefault('quizpassword', $quizconfig->password);
 260
 261         // IP address.
 262         $mform->addElement('text', 'subnet', get_string('requiresubnet', 'quiz'));
 263         $mform->setType('subnet', PARAM_TEXT);
 264         $mform->addHelpButton('subnet', 'requiresubnet', 'quiz');
 265         $mform->setAdvanced('subnet', $quizconfig->subnet_adv);
 266         $mform->setDefault('subnet', $quizconfig->subnet);
 267
 268         // Enforced time delay between quiz attempts.
 269         $mform->addElement('duration', 'delay1', get_string('delay1st2nd', 'quiz'),
 270                 array('optional' => true));
 271         $mform->addHelpButton('delay1', 'delay1st2nd', 'quiz');
 272         $mform->setAdvanced('delay1', $quizconfig->delay1_adv);
 273         $mform->setDefault('delay1', $quizconfig->delay1);
 274         $mform->disabledIf('delay1', 'attempts', 'eq', 1);
 275
 276         $mform->addElement('duration', 'delay2', get_string('delaylater', 'quiz'),
 277                 array('optional' => true));
 278         $mform->addHelpButton('delay2', 'delaylater', 'quiz');
 279         $mform->setAdvanced('delay2', $quizconfig->delay2_adv);
 280         $mform->setDefault('delay2', $quizconfig->delay2);
 281         $mform->disabledIf('delay2', 'attempts', 'eq', 1);
 282         $mform->disabledIf('delay2', 'attempts', 'eq', 2);
 283
 284         // 'Secure' window.
 285         $mform->addElement('select', 'browsersecurity', get_string('browsersecurity', 'quiz'),
 286                 quiz_access_manager::get_browser_security_choices());
 287         $mform->addHelpButton('browsersecurity', 'browsersecurity', 'quiz');
 288         $mform->setAdvanced('browsersecurity', $quizconfig->browsersecurity_adv);
 289         $mform->setDefault('browsersecurity', $quizconfig->browsersecurity);
 290
 291         // Any other rule plugins.
 292         quiz_access_manager::add_settings_form_fields($this, $mform);
 293
 294         //-------------------------------------------------------------------------------
 295         $mform->addElement('header', 'overallfeedbackhdr', get_string('overallfeedback', 'quiz'));
 296         $mform->addHelpButton('overallfeedbackhdr', 'overallfeedback', 'quiz');
 297
 298         if (isset($this->current->grade)) {
 299             $needwarning = $this->current->grade === 0;
 300         } else {
 301             $needwarning = $quizconfig->maximumgrade == 0;
 302         }
 303         if ($needwarning) {
 304             $mform->addElement('static', 'nogradewarning', '',
 305                     get_string('nogradewarning', 'quiz'));
 306         }
 307
 308         $mform->addElement('static', 'gradeboundarystatic1',
 309                 get_string('gradeboundary', 'quiz'), '100%');
 310
 311         $repeatarray = array();
 312         $repeatedoptions = array();
 313         $repeatarray[] = MoodleQuickForm::createElement('editor', 'feedbacktext',
 314                 get_string('feedback', 'quiz'), null, array('maxfiles' => EDITOR_UNLIMITED_FILES,
 315                         'noclean' => true, 'context' => $this->context));
 316         $repeatarray[] = MoodleQuickForm::createElement('text', 'feedbackboundaries',
 317                 get_string('gradeboundary', 'quiz'), array('size' => 10));
 318         $repeatedoptions['feedbacktext']['type'] = PARAM_RAW;
 319         $repeatedoptions['feedbackboundaries']['type'] = PARAM_RAW;
 320
 321         if (!empty($this->_instance)) {
 322             $this->_feedbacks = $DB->get_records('quiz_feedback',
 323                     array('quizid' => $this->_instance), 'mingrade DESC');
 324         } else {
 325             $this->_feedbacks = array();
 326         }
 327         $numfeedbacks = max(count($this->_feedbacks) * 1.5, 5);
 328
 329         $nextel = $this->repeat_elements($repeatarray, $numfeedbacks - 1,
 330                 $repeatedoptions, 'boundary_repeats', 'boundary_add_fields', 3,
 331                 get_string('addmoreoverallfeedbacks', 'quiz'), true);
 332
 333         // Put some extra elements in before the button
 334         $mform->insertElementBefore(MoodleQuickForm::createElement('editor',
 335                 "feedbacktext[$nextel]", get_string('feedback', 'quiz'), null,
 336                 array('maxfiles' => EDITOR_UNLIMITED_FILES, 'noclean' => true,
 337                       'context' => $this->context)),
 338                 'boundary_add_fields');
 339         $mform->insertElementBefore(MoodleQuickForm::createElement('static',
 340                 'gradeboundarystatic2', get_string('gradeboundary', 'quiz'), '0%'),
 341                 'boundary_add_fields');
 342
 343         // Add the disabledif rules. We cannot do this using the $repeatoptions parameter to
 344         // repeat_elements because we don't want to dissable the first feedbacktext.
 345         for ($i = 0; $i < $nextel; $i++) {
 346             $mform->disabledIf('feedbackboundaries[' . $i . ']', 'grade', 'eq', 0);
 347             $mform->disabledIf('feedbacktext[' . ($i + 1) . ']', 'grade', 'eq', 0);
 348         }
 349
 350         //-------------------------------------------------------------------------------
 351         $this->standard_coursemodule_elements();
 352
 353         //-------------------------------------------------------------------------------
 354         // buttons
 355         $this->add_action_buttons();
 356     }
 357
 358     protected function add_review_options_group($mform, $quizconfig, $whenname, $when) {
 359         $group = array();
 360         foreach (self::$reviewfields as $field => $label) {
 361             $group[] = $mform->createElement('checkbox', $field . $whenname, '', $label);
 362         }
 363         $mform->addGroup($group, $whenname . 'optionsgrp',
 364                 get_string('review' . $whenname, 'quiz'), null, false);
 365
 366         foreach (self::$reviewfields as $field => $notused) {
 367             $cfgfield = 'review' . $field;
 368             if ($quizconfig->$cfgfield & $when) {
 369                 $mform->setDefault($field . $whenname, 1);
 370             } else {
 371                 $mform->setDefault($field . $whenname, 0);
 372             }
 373         }
 374
 375         $mform->disabledIf('correctness' . $whenname, 'attempt' . $whenname);
 376         $mform->disabledIf('specificfeedback' . $whenname, 'attempt' . $whenname);
 377         $mform->disabledIf('generalfeedback' . $whenname, 'attempt' . $whenname);
 378         $mform->disabledIf('rightanswer' . $whenname, 'attempt' . $whenname);
 379     }
 380
 381     protected function preprocessing_review_settings(&$toform, $whenname, $when) {
 382         foreach (self::$reviewfields as $field => $notused) {
 383             $fieldname = 'review' . $field;
 384             if (array_key_exists($fieldname, $toform)) {
 385                 $toform[$field . $whenname] = $toform[$fieldname] & $when;
 386             }
 387         }
 388     }
 389
 390     public function data_preprocessing(&$toform) {
 391         if (isset($toform['grade'])) {
 392             // Convert to a real number, so we don't get 0.0000.
 393             $toform['grade'] = $toform['grade'] + 0;
 394         }
 395
 396         if (count($this->_feedbacks)) {
 397             $key = 0;
 398             foreach ($this->_feedbacks as $feedback) {
 399                 $draftid = file_get_submitted_draft_itemid('feedbacktext['.$key.']');
 400                 $toform['feedbacktext['.$key.']']['text'] = file_prepare_draft_area(
 401                     $draftid,               // draftid
 402                     $this->context->id,     // context
 403                     'mod_quiz',             // component
 404                     'feedback',             // filarea
 405                     !empty($feedback->id) ? (int) $feedback->id : null, // itemid
 406                     null,
 407                     $feedback->feedbacktext // text
 408                 );
 409                 $toform['feedbacktext['.$key.']']['format'] = $feedback->feedbacktextformat;
 410                 $toform['feedbacktext['.$key.']']['itemid'] = $draftid;
 411
 412                 if ($toform['grade'] == 0) {
 413                     // When a quiz is un-graded, there can only be one lot of
 414                     // feedback. If the quiz previously had a maximum grade and
 415                     // several lots of feedback, we must now avoid putting text
 416                     // into input boxes that are disabled, but which the
 417                     // validation will insist are blank.
 418                     break;
 419                 }
 420
 421                 if ($feedback->mingrade > 0) {
 422                     $toform['feedbackboundaries['.$key.']'] =
 423                             (100.0 * $feedback->mingrade / $toform['grade']) . '%';
 424                 }
 425                 $key++;
 426             }
 427         }
 428
 429         if (isset($toform['timelimit'])) {
 430             $toform['timelimitenable'] = $toform['timelimit'] > 0;
 431         }
 432
 433         $this->preprocessing_review_settings($toform, 'during',
 434                 mod_quiz_display_options::DURING);
 435         $this->preprocessing_review_settings($toform, 'immediately',
 436                 mod_quiz_display_options::IMMEDIATELY_AFTER);
 437         $this->preprocessing_review_settings($toform, 'open',
 438                 mod_quiz_display_options::LATER_WHILE_OPEN);
 439         $this->preprocessing_review_settings($toform, 'closed',
 440                 mod_quiz_display_options::AFTER_CLOSE);
 441         $toform['attemptduring'] = true;
 442         $toform['overallfeedbackduring'] = false;
 443
 444         // Password field - different in form to stop browsers that remember
 445         // passwords from getting confused.
 446         if (isset($toform['password'])) {
 447             $toform['quizpassword'] = $toform['password'];
 448             unset($toform['password']);
 449         }
 450
 451         // Load any settings belonging to the access rules.
 452         if (!empty($toform['instance'])) {
 453             $accesssettings = quiz_access_manager::load_settings($toform['instance']);
 454             foreach ($accesssettings as $name => $value) {
 455                 $toform[$name] = $value;
 456             }
 457         }
 458     }
 459
 460     public function validation($data, $files) {
 461         $errors = parent::validation($data, $files);
 462
 463         // Check open and close times are consistent.
 464         if ($data['timeopen'] != 0 && $data['timeclose'] != 0 &&
 465                 $data['timeclose'] < $data['timeopen']) {
 466             $errors['timeclose'] = get_string('closebeforeopen', 'quiz');
 467         }
 468
 469         // Check the boundary value is a number or a percentage, and in range.
 470         $i = 0;
 471         while (!empty($data['feedbackboundaries'][$i] )) {
 472             $boundary = trim($data['feedbackboundaries'][$i]);
 473             if (strlen($boundary) > 0 && $boundary[strlen($boundary) - 1] == '%') {
 474                 $boundary = trim(substr($boundary, 0, -1));
 475                 if (is_numeric($boundary)) {
 476                     $boundary = $boundary * $data['grade'] / 100.0;
 477                 } else {
 478                     $errors["feedbackboundaries[$i]"] =
 479                             get_string('feedbackerrorboundaryformat', 'quiz', $i + 1);
 480                 }
 481             }
 482             if (is_numeric($boundary) && $boundary <= 0 || $boundary >= $data['grade'] ) {
 483                 $errors["feedbackboundaries[$i]"] =
 484                         get_string('feedbackerrorboundaryoutofrange', 'quiz', $i + 1);
 485             }
 486             if (is_numeric($boundary) && $i > 0 &&
 487                     $boundary >= $data['feedbackboundaries'][$i - 1]) {
 488                 $errors["feedbackboundaries[$i]"] =
 489                         get_string('feedbackerrororder', 'quiz', $i + 1);
 490             }
 491             $data['feedbackboundaries'][$i] = $boundary;
 492             $i += 1;
 493         }
 494         $numboundaries = $i;
 495
 496         // Check there is nothing in the remaining unused fields.
 497         if (!empty($data['feedbackboundaries'])) {
 498             for ($i = $numboundaries; $i < count($data['feedbackboundaries']); $i += 1) {
 499                 if (!empty($data['feedbackboundaries'][$i] ) &&
 500                         trim($data['feedbackboundaries'][$i] ) != '') {
 501                     $errors["feedbackboundaries[$i]"] =
 502                             get_string('feedbackerrorjunkinboundary', 'quiz', $i + 1);
 503                 }
 504             }
 505         }
 506         for ($i = $numboundaries + 1; $i < count($data['feedbacktext']); $i += 1) {
 507             if (!empty($data['feedbacktext'][$i]['text']) &&
 508                     trim($data['feedbacktext'][$i]['text'] ) != '') {
 509                 $errors["feedbacktext[$i]"] =
 510                         get_string('feedbackerrorjunkinfeedback', 'quiz', $i + 1);
 511             }
 512         }
 513
 514         return $errors;
 515     }
 516 }