Illuminate\Routing\Router::delete PHP Method

    public function delete($uri, $action = null)
    {
        return $this->addRoute('DELETE', $uri, $action);
    }

 /**
  * Define the routes for the application.
  *
  * @param \Illuminate\Routing\Router $router
  *
  * @return void
  */
 public function map(Router $router)
 {
     $router->group(['namespace' => $this->namespace], function (Router $router) {
         /*
          * Admin routes
          */
         $router->get('admin/attribute-groups', 'AttributeGroupsAdminController@index')->name('admin::index-attribute_groups');
         $router->get('admin/attribute-groups/create', 'AttributeGroupsAdminController@create')->name('admin::create-attribute_group');
         $router->get('admin/attribute-groups/{group}/edit', 'AttributeGroupsAdminController@edit')->name('admin::edit-attribute_group');
         $router->post('admin/attribute-groups', 'AttributeGroupsAdminController@store')->name('admin::store-attribute_group');
         $router->put('admin/attribute-groups/{group}', 'AttributeGroupsAdminController@update')->name('admin::update-attribute_group');
         $router->get('admin/attribute-groups/{group}/attributes', 'AdminController@index')->name('admin::index-attributes');
         $router->get('admin/attribute-groups/{group}/attributes/create', 'AdminController@create')->name('admin::create-attribute');
         $router->get('admin/attribute-groups/{group}/attributes/{attribute}/edit', 'AdminController@edit')->name('admin::edit-attribute');
         $router->post('admin/attribute-groups/{group}/attributes', 'AdminController@store')->name('admin::store-attribute');
         $router->put('admin/attribute-groups/{group}/attributes/{attribute}', 'AdminController@update')->name('admin::update-attribute');
         $router->post('admin/attributes/sort', 'AdminController@sort')->name('admin::sort-menulinks');
         /*
          * API routes
          */
         $router->get('api/attributes', 'ApiController@index')->name('api::index-attributes');
         $router->put('api/attributes/{attribute}', 'ApiController@update')->name('api::update-attribute');
         $router->delete('api/attributes/{attribute}', 'ApiController@destroy')->name('api::destroy-attribute');
         $router->get('api/attribute-groups', 'AttributeGroupsApiController@index')->name('api::index-attribute_groups');
         $router->put('api/attribute-groups/{attribute}', 'AttributeGroupsApiController@update')->name('api::update-attribute_group');
         $router->delete('api/attribute-groups/{attribute}', 'AttributeGroupsApiController@destroy')->name('api::destroy-attribute_group');
     });
 }