C:/xampp/htdocs/moodle/question/type/randomsamatch/edit_randomsamatch_form.php

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<?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/>.

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


class qtype_randomsamatch_edit_form extends question_edit_form {
    protected function definition_inner($mform) {
        $questionstoselect = array();
        for ($i = 2; $i <= qtype_randomsamatch::MAX_SUBQUESTIONS; $i++) {
            $questionstoselect[$i] = $i;
        }

        $mform->addElement('select', 'choose',
                get_string('randomsamatchnumber', 'quiz'), $questionstoselect);
        $mform->setType('feedback', PARAM_RAW);

        $mform->addElement('hidden', 'fraction', 0);
        $mform->setType('fraction', PARAM_RAW);
    }

    protected function data_preprocessing($question) {
        if (empty($question->name)) {
            $question->name = get_string('randomsamatch', 'quiz');
        }

        if (empty($question->questiontext)) {
            $question->questiontext = get_string('randomsamatchintro', 'quiz');
        }
        return $question;
    }

    public function qtype() {
        return 'randomsamatch';
    }

    public function validation($data, $files) {
        global $DB;
        $errors = parent::validation($data, $files);
        if (isset($data->categorymoveto)) {
            list($category) = explode(',', $data['categorymoveto']);
        } else {
            list($category) = explode(',', $data['category']);
        }
        $saquestions = question_bank::get_qtype('randomsamatch')->get_sa_candidates($category);
        $numberavailable = count($saquestions);
        if ($saquestions === false) {
            $a = new stdClass();
            $a->catname = $DB->get_field('question_categories', 'name', array('id' => $category));
            $errors['choose'] = get_string('nosaincategory', 'qtype_randomsamatch', $a);

        } else if ($numberavailable < $data['choose']) {
            $a = new stdClass();
            $a->catname = $DB->get_field('question_categories', 'name', array('id' => $category));
            $a->nosaquestions = $numberavailable;
            $errors['choose'] = get_string('notenoughsaincategory', 'qtype_randomsamatch', $a);
        }
        return $errors;
    }
}