to go to same page after login

use this code in every pages
<?php
session_start(); // starts the session
$_SESSION['url'] = $_SERVER['REQUEST_URI']; // i.e. "abc.php"

code to be used in login page

<?php
session_start();  // needed for sessions.
if(isset($_SESSION['url']))
   $url = $_SESSION['url']; // holds url for last page visited.
else
   $url = "index.php"; // default page for

header("Location: http://example.com/$url"); // perform correct redirect.