Podgląd pliku: / books_opac / includes / checksum.php

<?php
/***************************************************** 
 *         System biblioteczny - Modul OPAC          * 
 ***************************************************** 
 * Wersja: 1.2 Stable                                * 
 * Data: 21.08.2010 (13:45)                          * 
 * Autor: Jacek Kowalski (http://jacekk.info)        * 
 *                                                   * 
 * Strona WWW: http://dev.jacekk.net/books           * 
 *                                                   * 
 * Utwor rozprowadzany na licencji                   * 
 * http://creativecommons.org/licenses/by-nc-sa/2.5/ * 
 *****************************************************/

class checksum {
    static function EAN($kod) {
        $kod = str_split($kod);
        
        $now = 1;
        foreach($kod as $v) {
            if($now==1) {
                $sum += $v;
                $now = 3;
            }
            else
            {
                $sum += $v*3;
                $now = 1;
            }
        }
        
        return (10 - ($sum%10)) % 10;
    }
    
    static function ISBN($kod) {
        $kod = str_split($kod);
        
        foreach($kod as $k => $v) {
            $sum += (10-$k)*$v;
        }
        
        $sum = (11 - ($sum % 11)) % 11;
        if($sum == 10) {
            $sum = 'X';
        }
        
        return $sum;
    }
    
    static function ISSN($kod) {
        $kod = str_split($kod);
        
        foreach($kod as $k => $v) {
            $sum += (8-$k)*$v;
        }
        
        $sum = (11 - ($sum % 11)) % 11;
        if($sum == 10) {
            $sum = 'X';
        }
        
        return $sum;
    }
}
?>

Browse Code © 2010 by Jacek Kowalski