Sums of Digits, algorithm and code

sum.php

<?php
# Sums of Digits
# Algorythm and code
# By Mr CaT
# Copyright (c) 2017

function fix($a,$b,$c)
{
    global $d; # Our global var, will be $d
    $d = $a * $b + $c; # D is a * b and plus c
    # Convert string to array
    $ar = str_split($d);
    # Our var result must be empty
    $result = "";
    for($i=0;$len = sizeof($ar), $i < $len; $i++) {
        # The same thing like '$result = $result + $ar[$i]';
        # We just plus all elements of array
        $result += $ar[$i];
    }
    # Printing the result
    echo $result;
}

# The result will be '14'
fix(255, 12, 32);