dijkstra hash in php

*.php

function myhash($str) {
    $result = 5381;
    for($i=0; $i<strlen($str); $i++) {
        $c = (int) $str[$i];
        $result = (($result << 5) + $result) + $c;
    }
    return $result;
}
$str = "aabbcc";
echo "Hash for ".$str." = ". myhash($str);