Eloy Lafuente
59 lines
2.2 KiB
PHP
59 lines
2.2 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* @package moodlecore
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* @subpackage backup-helper
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* @copyright 2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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/**
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* Non instantiable helper class providing general helper methods for backup/restore
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*
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* This class contains various general helper static methods available for backup/restore
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*
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* TODO: Finish phpdocs
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*/
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abstract class backup_general_helper extends backup_helper {
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/**
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* Calculate one checksum for any array/object. Works recursively
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*/
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public static function array_checksum_recursive($arr) {
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$checksum = ''; // Init checksum
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// Check we are going to process one array always, objects must be cast before
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if (!is_array($arr)) {
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throw new backup_helper_exception('array_expected');
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}
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foreach ($arr as $key => $value) {
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if ($value instanceof checksumable) {
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$checksum = md5($checksum . '-' . $key . '-' . $value->calculate_checksum());
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} else if (is_object($value)) {
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$checksum = md5($checksum . '-' . $key . '-' . self::array_checksum_recursive((array)$value));
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} else if (is_array($value)) {
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$checksum = md5($checksum . '-' . $key . '-' . self::array_checksum_recursive($value));
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} else {
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$checksum = md5($checksum . '-' . $key . '-' . $value);
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}
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}
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return $checksum;
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}
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}
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