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@ 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 git.master, git.master_jit, rfc.property-hooks: 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

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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