在Laravel中：如何根据URI对整个路由集应用多个过滤器？

In Laravel framework: Documentations (route filter section) says:

You may also specify that a filter applies to an entire set of routes based on their URI.

Route::filter('admin', function()
{
    //
});

Route::when('admin/*', 'admin');

What if I have more than one filter and wanted to apply them all on an entire set of routes based on their URI? Should I apply them like this:

Route::when('admin/*', 'filter_1');
Route::when('admin/*', 'filter_2');
Route::when('admin/*', 'filter_3');

Or I can put them all in an array and apply them like this:

Route::when('admin/*', array('filter_1', 'filter_2', 'filter_3'));

After trying I have found that using

Route::when('admin/*', array('filter_1', 'filter_2', 'filter_3'));

will perform the same result, so YES, I can use the above line instead of the next 3 lines

Route::when('admin/*', 'filter_1');
Route::when('admin/*', 'filter_2');
Route::when('admin/*', 'filter_3');

And note that filters will be applied respectively, which means filter_1 will be applied first, and if everything is ok filter_2 will apply and so on.