Code not working

[tyra]

What am i dong wrong here and is there any other solutions to solve this problem ?

 

<?php
$num = 256; 
function atotal($num){ 
$num = strval($num); 
while(strlen($num) < 2){ 
for($i = 0; $i < strlen($num); $i++){ 
$total = $num{$i}; 
} 
$num = $total; 
if(strlen(strval($total)) != 1){ 
$total = 0; 
} 
} 
return $total; 
} 
echo atotal($num);
?>

[ignace]

<?php
function strsum($str) {
    if (!is_numeric($str)) return 0;
    $str = strval($str);
    for ($i = 0; $i < strlen($str); $i++) {
        $sum += intval($str[$i]);
    }
    return $sum;
}

print strsum(256); // 13
?>