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E:/E/GEAMP/www/openbiz/openbiz/others/Zend/Validate/Barcode/UpcA.php

00001 <?php
00002 
00027 require_once 'Zend/Validate/Abstract.php';
00028 
00029 
00036 class Zend_Validate_Barcode_UpcA extends Zend_Validate_Abstract
00037 {
00042     const INVALID = 'invalid';
00043 
00048     const INVALID_LENGTH = 'invalidLength';
00049 
00055     protected $_messageTemplates = array(
00056         self::INVALID        => "'%value%' is an invalid UPC-A barcode",
00057         self::INVALID_LENGTH => "'%value%' should be 12 characters",
00058     );
00059 
00068     public function isValid($value)
00069     {
00070         if (!is_string($value)) {
00071             $this->_error(self::INVALID);
00072             return false;
00073         }
00074 
00075         $this->_setValue($value);
00076         if (strlen($value) !== 12) {
00077             $this->_error(self::INVALID_LENGTH);
00078             return false;
00079         }
00080 
00081         $barcode = substr($value, 0, -1);
00082         $oddSum  = 0;
00083         $evenSum = 0;
00084 
00085         for ($i = 0; $i < 11; $i++) {
00086             if ($i % 2 === 0) {
00087                 $oddSum += $barcode[$i] * 3;
00088             } elseif ($i % 2 === 1) {
00089                 $evenSum += $barcode[$i];
00090             }
00091         }
00092 
00093         $calculation = ($oddSum + $evenSum) % 10;
00094         $checksum    = ($calculation === 0) ? 0 : 10 - $calculation;
00095 
00096         if ($value[11] != $checksum) {
00097             $this->_error(self::INVALID);
00098             return false;
00099         }
00100 
00101         return true;
00102     }
00103 }

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