session _problem

<!DOCTYPE html>
<?php
session_start();
include ('connection.php');


if (isset($_POST['user']) and isset($_POST['password'])){

	$username = $_POST['user'];
	$password = $_POST['password'];

	$query = "SELECT * FROM users WHERE stud_matricno ='$username' and stud_password='$password'";
	$result = mysqli_query($conn, $query) or die(mysqli_error($conn));
	$get_log = mysqli_fetch_assoc($result);
	$count = mysqli_num_rows($result);

	if ($count == 1){
		$_SESSION['user'] = $username;

		while($row = mysqli_fetch_assoc($result)) {
               $status = $row["status"];
            }
			if($status == 'student'){
			 	$qr_log1 = "SELECT * FROM users WHERE stud_matricno ='$username'";
				$result1 = mysqli_query($conn,$qr_log1);
				$get_log1 = mysqli_fetch_assoc($result1);
				$get_password = $get_log1['stud_password'];
				$get_username = $get_log1['stud_matricno'];

				if($password !== $get_password)
				{
					print "<script language=\"javascript\" type=\"text/javascript\">
					<!--
					window.setTimeout('window.location=\"index.php\"; ',0);
					//-->
					</script> ";
					echo "<script type='text/javascript'>alert('Wrong password. Please try again!');</script>";
					echo mysqli_error($con);
				}
				else
				{
					$_SESSION['stud_matricno']=$get_username;
					print "<script language=\"javascript\" type=\"text/javascript\">
					<!--
					window.setTimeout('window.location=\"student.php\"; ',0);
					//-->
					</script> ";
					echo "<script>alert('Congratulation, you have sucessful login into the site!');</script>";

				}
			}elseif ($status == 'staff'){
			 	header("location: /completeise/staff/content/index.php");

			 }else if ($status == 'admin'){
			 	header("location: /completeise/admin/content/index.php");

			 }


	} else{
			print "<script language=\"javascript\" type=\"text/javascript\">
			<!--
			window.setTimeout('window.location=\"error.php\"; ',0);
			//-->
			</script> ";
			echo "<script>alert('Username not registered yet!');</script>";
	}
}
?>