Problém se session - data z mysql

$sql = mysql_query("SELECT * FROM uzivatele WHERE email='$email' AND heslo='$pass' AND email_activated='1'"); 
		$login_check = mysql_num_rows($sql);
        
		if($login_check > 0){ 
    			while($row = mysql_fetch_array($sql)){
					

					$id = $row["id"];   
					$_SESSION['id'] = $id;
					echo $_SESSION['id'];	
					
					$_SESSION['idx'] = base64_encode("g4p3h9xfn8sq03hs2234$id");
                    
					$username = $row["username"];
					$_SESSION['username'] = $username;
					
					$useremail = $row["email"];
					$_SESSION['useremail'] = $useremail;
					
					$userpass = $row["password"];
					$_SESSION['userpass'] = $userpass;
        
    			}