Iterated salted hash function example in PHP

/*
   Created By Abraham Aranguren <name.surname@gmail.com> Twitter: @7a_ http://7-a.org
   Iterates a salted hash function for secure password storage
   Please see this link for more info: http://owasp.com/index.php/Password_Storage_Cheat_Sheet
*/
function GetHash($Password, $SystemSalt, $UserSalt) {
    $Hash = $Password
    foreach (range(0, 1000000) as $i) {
        $Hash = sha512($Hash + $SystemSalt + $UserSalt + $i)
    }
    return $Hash