单击链接时强制用户登录

Question

i have this code which i am using to send an approval to a user email. what i need is : when the user clicks on the link; he should first login and then he can proceed the approval process. I tried the following code to check if the session is not registered,then to force the user to login (index.php):

global $user_ID;
$user_ID = $_SESSION['empName'];
if ($user_ID == '') { 
header('Location: index.php'); exit(); 
} 
echo "<INPUT type='hidden' name='Code' size = '6' value ='hr1.php' />";
if(isset($_POST['Code'])){$Code = $_POST['Code'];}
mysql_close($con);

now i need a method to redirect user to the previous page (link)

any ideas???

Answer 1

While redirecting to login page then store a session value called return_url

$_SESSION['return_url'] = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

Then if login is successful then check if return_url exists / not. If exists then return back to $_SESSION['return_url']

header("Location: ".$_SESSION['return_url']);