Ayuda - loggin de usuarios

[dcreate]

trata de usar la instruccion strtoupper

Código PHP:

<?
session_start();
include("config.php");
header("Cache-control: private");
$username = strtoupper($_POST['username']);
$password = md5($_POST['password']);
$info = mysql_query("SELECT * FROM `users` WHERE `username` = '$username'") or die(mysql_error());  
$data = mysql_fetch_array($info); 
if ($username == $data[username] && $password == $data[password]){
$_SESSION["status"] = "loggedin";
$_SESSION["username"] = $username;
$_SESSION["password"] = $password;
header("Location: /?p=welcome"); /*If verification succesfull redirect back to index*/
exit;
}else{
header("Location: /?invalid=true");
} // Close tab
include("closedb.php");
?>
 

y si te sirve tambien te dejo este aporte