Trim all input values in Laravel 4

filters.php

<?php

/*
*  In Laravel Filters...
*/

App::before(function (\Illuminate\Http\Request $request) 
{
      $request->merge(
          array_map_recursive(
              "trim",
              array_except(
                  $request->all(),
                  ["password", "password_confirmation"]
              )
          )
      );
});

helpers.php

<?php

/*
*  In Laravel helpers...
*/

function array_map_recursive($callback, $array)
{
    foreach ($array as $key => $value) {
        if (is_array($array[$key])) {
            $array[$key] = array_map_recursive($callback, $array[$key]);
        } else {
            $array[$key] = call_user_func($callback, $array[$key]);
        }
    }

    return $array;
}