session.php

<?php
	session_start();
   include "dbconnection.php";
   
   $user_check = $_SESSION['login_user'];
   
   $ses_sql = mysqli_query($connection,"select username from User where username = '$user_check'");	
   $row = mysqli_fetch_array($ses_sql,MYSQLI_ASSOC);
   $login_session = $row['username'];
   
   if(!isset($_SESSION['login_user'])){
      header("location:index.php");
   }
?>