login_PHP

if(isset($_POST['submit1']))
{
		require_once 'config.php';
		$_SESSION['username'] = $_POST['username'];
		$myusername = $_SESSION['username'];
		$mypassword = $_POST['password'];

		$sql = "SELECT * FROM customer WHERE CusID = '$myusername' and Pass = '$mypassword'";
      $result = mysqli_query($conn,$sql);
      $row = mysqli_fetch_array($result,MYSQLI_ASSOC);
       $_SESSION['CusName'] = $row['CusName'];



      // If result matched $myusername and $mypassword, table row must be 1 row

      if($row['CusID'] == $myusername && $row['Pass'] == $mypassword)
	  {

		header("Location: menu.php");

      }
	  if($row['CusID'] != $myusername)
	  { ?>
		  <script language="javascript">
			alert("You are not registered")</script>
	<?php  }