1: <?php
 2: 
 3: /**
 4:  * Jyxo PHP Library
 5:  *
 6:  * LICENSE
 7:  *
 8:  * This source file is subject to the new BSD license that is bundled
 9:  * with this package in the file license.txt.
10:  * It is also available through the world-wide-web at this URL:
11:  * https://github.com/jyxo/php/blob/master/license.txt
12:  */
13: 
14: /**
15:  * Validates IČ (Czech company number).
16:  *
17:  * Taken from David Grudl's http://latrine.dgx.cz/jak-overit-platne-ic-a-rodne-cislo
18:  *
19:  * @category Jyxo
20:  * @package Jyxo_Input
21:  * @subpackage Validator
22:  * @copyright Copyright (c) 2005-2011 Jyxo, s.r.o.
23:  * @license https://github.com/jyxo/php/blob/master/license.txt
24:  * @author Jaroslav Hanslík
25:  */
26: class Jyxo_Input_Validator_IsCompanyId extends Jyxo_Input_Validator_AbstractValidator
27: {
28:     /**
29:      * Validates a value.
30:      *
31:      * @param mixed $value Input value
32:      * @return boolean
33:      */
34:     public function isValid($value)
35:     {
36:         // Removes spaces
37:         $companyId = preg_replace('~\s+~', '', (string) $value);
38: 
39:         // Only numbers
40:         if (!preg_match('~^\d{8}$~', $companyId)) {
41:             return false;
42:         }
43: 
44:         // Checksum
45:         $a = 0;
46:         for ($i = 0; $i < 7; $i++) {
47:             $a += $companyId[$i] * (8 - $i);
48:         }
49: 
50:         $a = $a % 11;
51:         if (0 === $a) {
52:             $c = 1;
53:         } elseif (10 === $a) {
54:             $c = 1;
55:         } elseif (1 === $a) {
56:             $c = 0;
57:         } else {
58:             $c = 11 - $a;
59:         }
60: 
61:         if ((int) $companyId[7] !== $c) {
62:             return false;
63:         }
64: 
65:         return true;
66:     }
67: }
68: