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See Release Notes
Long Term Support Release

  • Bug fixes for general core bugs in 4.1.x will end 13 November 2023 (12 months).
  • Bug fixes for security issues in 4.1.x will end 10 November 2025 (36 months).
  • PHP version: minimum PHP 7.4.0 Note: minimum PHP version has increased since Moodle 4.0. PHP 8.0.x is supported too.
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Question type class for the true-false question type.
 *
 * @package    qtype
 * @subpackage truefalse
 * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */


defined('MOODLE_INTERNAL') || die();

require_once($CFG->libdir . '/questionlib.php');


/**
 * The true-false question type class.
 *
 * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qtype_truefalse extends question_type {
    public function save_question_options($question) {
        global $DB;
        $result = new stdClass();
        $context = $question->context;

        // Fetch old answer ids so that we can reuse them.
        $oldanswers = $DB->get_records('question_answers',
                array('question' => $question->id), 'id ASC');

        // Save the true answer - update an existing answer if possible.
        $answer = array_shift($oldanswers);
        if (!$answer) {
            $answer = new stdClass();
            $answer->question = $question->id;
            $answer->answer = '';
            $answer->feedback = '';
            $answer->id = $DB->insert_record('question_answers', $answer);
        }

        $answer->answer   = get_string('true', 'qtype_truefalse');
        $answer->fraction = $question->correctanswer;
        $answer->feedback = $this->import_or_save_files($question->feedbacktrue,
                $context, 'question', 'answerfeedback', $answer->id);
        $answer->feedbackformat = $question->feedbacktrue['format'];
        $DB->update_record('question_answers', $answer);
        $trueid = $answer->id;

        // Save the false answer - update an existing answer if possible.
        $answer = array_shift($oldanswers);
        if (!$answer) {
            $answer = new stdClass();
            $answer->question = $question->id;
            $answer->answer = '';
            $answer->feedback = '';
            $answer->id = $DB->insert_record('question_answers', $answer);
        }

        $answer->answer   = get_string('false', 'qtype_truefalse');
        $answer->fraction = 1 - (int)$question->correctanswer;
        $answer->feedback = $this->import_or_save_files($question->feedbackfalse,
                $context, 'question', 'answerfeedback', $answer->id);
        $answer->feedbackformat = $question->feedbackfalse['format'];
        $DB->update_record('question_answers', $answer);
        $falseid = $answer->id;

        // Delete any left over old answer records.
        $fs = get_file_storage();
        foreach ($oldanswers as $oldanswer) {
            $fs->delete_area_files($context->id, 'question', 'answerfeedback', $oldanswer->id);
            $DB->delete_records('question_answers', array('id' => $oldanswer->id));
        }

        // Save question options in question_truefalse table.
        if ($options = $DB->get_record('question_truefalse', array('question' => $question->id))) {
            // No need to do anything, since the answer IDs won't have changed
            // But we'll do it anyway, just for robustness.
            $options->trueanswer  = $trueid;
            $options->falseanswer = $falseid;
> $options->showstandardinstruction = !empty($question->showstandardinstruction);
$DB->update_record('question_truefalse', $options); } else { $options = new stdClass(); $options->question = $question->id; $options->trueanswer = $trueid; $options->falseanswer = $falseid;
> $options->showstandardinstruction = !empty($question->showstandardinstruction);
$DB->insert_record('question_truefalse', $options); } $this->save_hints($question); return true; }
> public function save_defaults_for_new_questions(stdClass $fromform): void { /** > parent::save_defaults_for_new_questions($fromform); * Loads the question type specific options for the question. > $this->set_default_value('showstandardinstruction', $fromform->showstandardinstruction); */ > } public function get_question_options($question) { >
global $DB, $OUTPUT; parent::get_question_options($question); // Get additional information from database // and attach it to the question object. if (!$question->options = $DB->get_record('question_truefalse', array('question' => $question->id))) { echo $OUTPUT->notification('Error: Missing question options!'); return false; } // Load the answers. if (!$question->options->answers = $DB->get_records('question_answers', array('question' => $question->id), 'id ASC')) { echo $OUTPUT->notification('Error: Missing question answers for truefalse question ' . $question->id . '!'); return false; } return true; } protected function initialise_question_instance(question_definition $question, $questiondata) { parent::initialise_question_instance($question, $questiondata); $answers = $questiondata->options->answers; if ($answers[$questiondata->options->trueanswer]->fraction > 0.99) { $question->rightanswer = true; } else { $question->rightanswer = false; } $question->truefeedback = $answers[$questiondata->options->trueanswer]->feedback; $question->falsefeedback = $answers[$questiondata->options->falseanswer]->feedback; $question->truefeedbackformat = $answers[$questiondata->options->trueanswer]->feedbackformat; $question->falsefeedbackformat = $answers[$questiondata->options->falseanswer]->feedbackformat; $question->trueanswerid = $questiondata->options->trueanswer; $question->falseanswerid = $questiondata->options->falseanswer;
> $question->showstandardinstruction = $questiondata->options->showstandardinstruction;
} public function delete_question($questionid, $contextid) { global $DB; $DB->delete_records('question_truefalse', array('question' => $questionid)); parent::delete_question($questionid, $contextid); } public function move_files($questionid, $oldcontextid, $newcontextid) { parent::move_files($questionid, $oldcontextid, $newcontextid); $this->move_files_in_answers($questionid, $oldcontextid, $newcontextid); } protected function delete_files($questionid, $contextid) { parent::delete_files($questionid, $contextid); $this->delete_files_in_answers($questionid, $contextid); } public function get_random_guess_score($questiondata) { return 0.5; } public function get_possible_responses($questiondata) { return array( $questiondata->id => array( 0 => new question_possible_response(get_string('false', 'qtype_truefalse'), $questiondata->options->answers[ $questiondata->options->falseanswer]->fraction), 1 => new question_possible_response(get_string('true', 'qtype_truefalse'), $questiondata->options->answers[ $questiondata->options->trueanswer]->fraction), null => question_possible_response::no_response() ) ); } }