Getting the URL from where the user redirected in Laravel and add as URL parameter

You should have a filters file located at app/filters.php. If you open it up you should see this something like this:

Route::filter('auth', function() { }); 

This is the function that triggers before the route is served. Inside here you can redirect if they are not logged in. For example:

Route::filter('auth', function() { if (!Auth::check()) { // The user is not logged in so redirect them } }); 

For more information checkout the security section and the routing section of the docs.

Why not using Redirect::intended('fallback')? This redirects the user back to the page he was intended to look. You can also give a fallback url.

You can read more about it here.

EDIT: To be more specific you can do it like below:

Route::group(array('prefix' => 'admin','before' => 'auth'),function(){ //here you're admin routes }); 

In the filters file you change the auth filter to something like:

Route::filter('auth',function(){ if(!Auth::check()) return Redirect::guest('login'); }); 

The guest method make it so that the intended url is saved in the session. On the login page you can do this after you've attempted the users credentials:

Route::intended('fallback'); 

But when you really want to do it with a query parameter, just do this:

Route::filter('auth',function(){ if(!Auth::check()) return Redirect::to('login',array('Return_URL' => Route::current())); }); 

You could modify your 'auth' filter. If the user is not logged in, redirect to a login page.

Route::filter('auth', function(){ if Auth::guest(){ // sign them in } else{ return Redirect::to('pathToLogin'); } };