TCPDFBarcode::barcode_eanext PHP Method

    protected function barcode_eanext($code, $len = 5)
    {
        //Padding
        $code = str_pad($code, $len, '0', STR_PAD_LEFT);
        // calculate check digit
        if ($len == 2) {
            $r = $code % 4;
        } elseif ($len == 5) {
            $r = 3 * ($code[0] + $code[2] + $code[4]) + 9 * ($code[1] + $code[3]);
            $r %= 10;
        } else {
            return false;
        }
        //Convert digits to bars
        $codes = array('A' => array('0' => '0001101', '1' => '0011001', '2' => '0010011', '3' => '0111101', '4' => '0100011', '5' => '0110001', '6' => '0101111', '7' => '0111011', '8' => '0110111', '9' => '0001011'), 'B' => array('0' => '0100111', '1' => '0110011', '2' => '0011011', '3' => '0100001', '4' => '0011101', '5' => '0111001', '6' => '0000101', '7' => '0010001', '8' => '0001001', '9' => '0010111'));
        $parities = array();
        $parities[2] = array('0' => array('A', 'A'), '1' => array('A', 'B'), '2' => array('B', 'A'), '3' => array('B', 'B'));
        $parities[5] = array('0' => array('B', 'B', 'A', 'A', 'A'), '1' => array('B', 'A', 'B', 'A', 'A'), '2' => array('B', 'A', 'A', 'B', 'A'), '3' => array('B', 'A', 'A', 'A', 'B'), '4' => array('A', 'B', 'B', 'A', 'A'), '5' => array('A', 'A', 'B', 'B', 'A'), '6' => array('A', 'A', 'A', 'B', 'B'), '7' => array('A', 'B', 'A', 'B', 'A'), '8' => array('A', 'B', 'A', 'A', 'B'), '9' => array('A', 'A', 'B', 'A', 'B'));
        $p = $parities[$len][$r];
        $seq = '1011';
        // left guard bar
        $seq .= $codes[$p[0]][$code[0]];
        for ($i = 1; $i < $len; ++$i) {
            $seq .= '01';
            // separator
            $seq .= $codes[$p[$i]][$code[$i]];
        }
        $bararray = array('code' => $code, 'maxw' => 0, 'maxh' => 1, 'bcode' => array());
        return $this->binseq_to_array($seq, $bararray);
    }