[Bl4ckSh33p]

Hi. Thanks for sharing but I could not find much helpful info in it.
But I have a solution for my problem now.

foreach ($user_array as $nr => $inhalt) { 
        // Compare current item to the posted information 
        if($user == $inhalt["User"] AND $serial == $inhalt["Serial"]) { 
            // The current user matched, return info and exit 
            echo md5($user).md5($serial).'::'.$installed; 
            exit; 
        }  
}