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<?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)); } $str = get_luhn_checksum('0B022412500000009104', 16); echo $str;
Output for git.master, git.master_jit, rfc.property-hooks
char 0 is 4 adjustment is +8 running checksum is 8 char 1 is 0 adjustment is +0 running checksum is 8 char 2 is 1 adjustment is +2 running checksum is 10 char 3 is 9 adjustment is +9 running checksum is 19 char 4 is 0 adjustment is +0 running checksum is 19 char 5 is 0 adjustment is +0 running checksum is 19 char 6 is 0 adjustment is +0 running checksum is 19 char 7 is 0 adjustment is +0 running checksum is 19 char 8 is 0 adjustment is +0 running checksum is 19 char 9 is 0 adjustment is +0 running checksum is 19 char 10 is 0 adjustment is +0 running checksum is 19 char 11 is 5 adjustment is +5 running checksum is 24 char 12 is 2 adjustment is +4 running checksum is 28 char 13 is 1 adjustment is +1 running checksum is 29 char 14 is 4 adjustment is +8 running checksum is 37 char 15 is 2 adjustment is +2 running checksum is 39 char 16 is 2 adjustment is +4 running checksum is 43 char 17 is 0 adjustment is +0 running checksum is 43 char 18 is B adjustment is +22 running checksum is 65 char 19 is 0 adjustment is +0 running checksum is 65 Final checksum is 65 modded = 1 F

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