C:/xampp/htdocs/moodle/mod/url/backup/moodle2/backup_url_activity_task.class.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;

 // This activity has not particular settings but the inherited from the generic
 // backup_activity_task so here there isn't any class definition, like the ones
 // existing in /backup/moodle2/backup_settingslib.php (activities section)

require_once($CFG->dirroot . '/mod/url/backup/moodle2/backup_url_stepslib.php'); // Because it exists (must)

class backup_url_activity_task extends backup_activity_task {

    protected function define_my_settings() {
        // No particular settings for this activity
    }

    protected function define_my_steps() {
        $this->add_step(new backup_url_activity_structure_step('url_structure', 'url.xml'));
    }

    static public function encode_content_links($content) {
        global $CFG;

        $base = preg_quote($CFG->wwwroot.'/mod/url','#');

        //Access a list of all links in a course
        $pattern = '#('.$base.'/index\.php\?id=)([0-9]+)#';
        $replacement = '$@URLINDEX*$2@$';
        $content = preg_replace($pattern, $replacement, $content);

        //Access the link supplying a course module id
        $pattern = '#('.$base.'/view\.php\?id=)([0-9]+)#';
        $replacement = '$@URLVIEWBYID*$2@$';
        $content = preg_replace($pattern, $replacement, $content);

        //Access the link supplying an instance id
        $pattern = '#('.$base.'/view\.php\?u=)([0-9]+)#';
        $replacement = '$@URLVIEWBYU*$2@$';
        $content = preg_replace($pattern, $replacement, $content);

        return $content;
    }
}