Online PHP editor | output for 69Eh0

<?php session_start(); require "config.php"; //Check to see if the user is logged in. if(isset($_SESSION['username'])){ header("location: members.php"); } //Check to see if the user click the button if(isset($_POST['submit'])) { $user=$_POST['user']; $pass=$_POST['pass']; //Prevent MySQL Injections $user = stripslashes($user); $pass = stripslashes($pass); $user = mysqli_real_escape_string($con, $user); $pass = mysqli_real_escape_string($con, $pass); //Check to see if the user left any space empty! if($user == "" || $pass == "") { echo "Please fill in all the information!"; } //Check to see if the username AND password MATCHES the username AND password in the DB else { $query = mysqli_query($con,"SELECT * FROM members WHERE username = '$user' and password = '$pass'") or die("Can not query DB."); $count = mysqli_num_rows($query); if ($count == 1) { $_SESSION['username']=$user; //Create a session for the user! header ("location: members.php"); } else{ echo "Username and Password DO NOT MATCH! TRY AGAIN!"; } } } ?>