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69dd0c8c EL |
1 | <?php |
2 | ||
3 | // This file is part of Moodle - http://moodle.org/ | |
4 | // | |
5 | // Moodle is free software: you can redistribute it and/or modify | |
6 | // it under the terms of the GNU General Public License as published by | |
7 | // the Free Software Foundation, either version 3 of the License, or | |
8 | // (at your option) any later version. | |
9 | // | |
10 | // Moodle is distributed in the hope that it will be useful, | |
11 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | // GNU General Public License for more details. | |
14 | // | |
15 | // You should have received a copy of the GNU General Public License | |
16 | // along with Moodle. If not, see <http://www.gnu.org/licenses/>. | |
17 | ||
18 | /** | |
19 | * @package moodlecore | |
20 | * @subpackage backup-helper | |
21 | * @copyright 2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com} | |
22 | * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later | |
23 | */ | |
24 | ||
25 | /** | |
26 | * Non instantiable helper class providing general helper methods for backup/restore | |
27 | * | |
28 | * This class contains various general helper static methods available for backup/restore | |
29 | * | |
30 | * TODO: Finish phpdocs | |
31 | */ | |
32 | abstract class backup_general_helper extends backup_helper { | |
33 | ||
34 | /** | |
35 | * Calculate one checksum for any array/object. Works recursively | |
36 | */ | |
37 | public static function array_checksum_recursive($arr) { | |
38 | ||
39 | $checksum = ''; // Init checksum | |
40 | ||
41 | // Check we are going to process one array always, objects must be cast before | |
42 | if (!is_array($arr)) { | |
43 | throw new backup_helper_exception('array_expected'); | |
44 | } | |
45 | foreach ($arr as $key => $value) { | |
46 | if ($value instanceof checksumable) { | |
47 | $checksum = md5($checksum . '-' . $key . '-' . $value->calculate_checksum()); | |
48 | } else if (is_object($value)) { | |
49 | $checksum = md5($checksum . '-' . $key . '-' . self::array_checksum_recursive((array)$value)); | |
50 | } else if (is_array($value)) { | |
51 | $checksum = md5($checksum . '-' . $key . '-' . self::array_checksum_recursive($value)); | |
52 | } else { | |
53 | $checksum = md5($checksum . '-' . $key . '-' . $value); | |
54 | } | |
55 | } | |
56 | return $checksum; | |
57 | } | |
58 | } |