Query update result in huge unexpected number

user1251004

I have some problems with my hiscore table. Some players have got a lot of points really fast, more then possible. I post two code below:

The first one is the one I currently use, which cause the problem:

$name = mysql_real_escape_string($_POST['name']); 
$set = mysql_real_escape_string($_POST['set']); 


if ($set == 1 && isset($_POST['score']))
{
    $score = mysql_real_escape_string($_POST['score']); 

    $query = mysql_query("UPDATE users SET totalScore=totalScore + '$score' WHERE username='$name'"); 

    if ($query) 
    {
        echo 'success'; 
    }
    else {
        echo 'error'; 
    }

}

I tried to cast the score as an int in the code below, but the update result is a huge number (4294967295) to be set as the totalScore. The totalScore is of type int(25) and I set attribute to unsigned so a player can’t end up on the minus side.

Please help
Thanks

$name = mysql_real_escape_string($_POST['name']); 
$set = (int)$_POST['set']; 


if ($set == 1 && isset($_POST['score']))
{
    $score = (int)$_POST['score']; 

    $query = mysql_query("UPDATE users SET totalScore=totalScore + $score WHERE username='$name'"); 

    if ($query) 
    {
        echo 'success'; 
    }
    else {
        echo 'error'; 
    }

}