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Rev 121 Rev 134
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    public static function GTINCalcCheckDigit($p_sGTINCode) {
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    public static function GTINCalcCheckDigit($p_sGTINCode) {
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        $p_sGTINCode = (string)trim($p_sGTINCode);
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        $p_sGTINCode = (string)trim($p_sGTINCode);
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        if (preg_match('/[^0-9]/', $p_sGTINCode)) return false;
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        if (preg_match('/[^0-9]/', $p_sGTINCode)) return false;
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        $p_sGTINCode .= '0';
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        $p_sGTINCode .= 'X';
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        $sGTINCode = trim($p_sGTINCode);
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        $sGTINCode = trim($p_sGTINCode);
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        $length = strlen($sGTINCode);
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        $length = strlen($sGTINCode);
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        if (($length > 11 && $length <= 14) || $length == 8) {
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        if (($length > 11 && $length <= 14) || $length == 8) {
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            $zeroes = 18 - $length;
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            $zeroes = 18 - $length;
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            $length = null;
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            $length = null;
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                $fill .= "0";
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                $fill .= "0";
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            }
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            }
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            $zeroes = null;
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            $zeroes = null;
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            $sGTINCode = $fill . $sGTINCode;
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            $sGTINCode = $fill . $sGTINCode;
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            $fill = null;
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            $fill = null;
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        } else {
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            return false;
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        }
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        }
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        $iCalculation = 0;
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        $iCalculation = 0;
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        for ($i = 0;$i < (strlen($sGTINCode) - 1);$i++) {
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        for ($i = 0;$i < (strlen($sGTINCode) - 1);$i++) {
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            $iCalculation += $i % 2 ? $sGTINCode[$i] * 1 : $sGTINCode[$i] * 3;
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            $iCalculation += $i % 2 ? $sGTINCode[$i] * 1 : $sGTINCode[$i] * 3;
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        }
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        }