session.php

<?php
// Establishing Connection with Server by passing server_name, user_id and password as a parameter
$connection = mysql_connect("localhost", "root", "root123");
// Selecting Database
$db = mysql_select_db("online", $connection);

session_start();// Starting Session

// Storing Session
$user_check=$_SESSION['login_user'];

// SQL Query To Fetch Complete Information Of User
$ses_sql=mysql_query("select username from register where username='$user_check'", $connection);
$row = mysql_fetch_assoc($ses_sql);
$login_session =$row['username'];


if(!isset($login_session)){
mysql_close($connection); // Closing Connection
header("Location:../login/index.php");
}


?>