C:/xampp/htdocs/moodle/tag/tag_autocomplete.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/>.

define('AJAX_SCRIPT', true);

require_once('../config.php');
require_once('lib.php');

require_login();

if (empty($CFG->usetags)) {
    print_error('tagsaredisabled', 'tag');
}

$query = optional_param('query', '', PARAM_RAW);

if ($similar_tags = tag_autocomplete($query)) {
    foreach ($similar_tags as $tag) {
        echo clean_param($tag->name, PARAM_TAG) . "\t" . tag_display_name($tag) . "\n";
    }
}