Online PHP editor | output for aqU8h

@ 2015-08-04T11:29:57Z

<?php

/**
     * Get luhn checksum
     *
     * @param $str_string
     * @param $int_base
     * @return string
     */
    function get_luhn_checksum($str_string, $int_base) {
        $arr_chars = array_reverse(str_split($str_string));
        $int_check_sum = 0;
        foreach ($arr_chars AS $int_index=>$str_char) {
            $int_adjustment = ((int)base_convert($str_char, $int_base, 10)) * ($int_index % 2 ? 1 : 2);
            $int_check_sum += $int_adjustment;
            echo "char $int_index is $str_char adjustment is +$int_adjustment running checksum is $int_check_sum\n";
        }
        echo "Final checksum is $int_check_sum modded = " . ($int_check_sum % $int_base) . "\n";
        return strtoupper(base_convert($int_base - ($int_check_sum % $int_base), 10, $int_base));
    }
    
    echo get_luhn_checksum('7992739871', 10);
exit;    
    $str = get_luhn_checksum('0B022412500000009104', 16);
    echo $str;

Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: char 0 is 1 adjustment is +2 running checksum is 2 char 1 is 7 adjustment is +7 running checksum is 9 char 2 is 8 adjustment is +16 running checksum is 25 char 3 is 9 adjustment is +9 running checksum is 34 char 4 is 3 adjustment is +6 running checksum is 40 char 5 is 7 adjustment is +7 running checksum is 47 char 6 is 2 adjustment is +4 running checksum is 51 char 7 is 9 adjustment is +9 running checksum is 60 char 8 is 9 adjustment is +18 running checksum is 78 char 9 is 7 adjustment is +7 running checksum is 85 Final checksum is 85 modded = 5 5
Output for 4.4.5 - 4.4.9: Fatal error: Call to undefined function: str_split() in /in/aqU8h on line 11
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4: Fatal error: Call to undefined function: str_split() in /in/aqU8h on line 11
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Fatal error: Call to undefined function: str_split() in /in/aqU8h on line 11

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