C:/xampp/htdocs/moodle/backup/util/xml/output/memory_xml_output.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/>.

class memory_xml_output extends xml_output{

    protected $allcontents; // Here we'll store all the written contents

    public function __construct() {
        $this->allcontents = '';
        parent::__construct(false); // disable buffering
    }

    public function get_allcontents() {
        if ($this->running !== false) {
            throw new xml_output_exception('xml_output_not_stopped');
        }
        return $this->allcontents;
    }

// Private API starts here

    protected function init() {
        // Easy :-)
    }

    protected function finish() {
        // Trivial :-)
    }

    protected function send($content) {
        // Accumulate contents
        $this->allcontents .= $content;
    }

}