[woot]

Ehm, something like this should do it!? Just a bare example, don't forget to escape inputs, ...

PHP код:

$username = $_POST['username'];
$password = hash('whirlpool', $_POST['password']);
$mResult = mysql_query("SELECT NULL FROM `players` WHERE `name`='$username' AND `password`='$password' LIMIT 1");
if(!mysql_num_rows($mResult)) {
    // invalid
}
else {
    // valid
}}