Laravel: response mutators

mutators.php

<?php

Route::filter('after', function($response)
{
	$format = Input::get('format', Config::get('application.default_mutator'));

	$response->mutator = $format;
});

Route::mutator('string', function($response) {
	$response->content = (string) $response->content;
	return $response;
});

Route::mutator('json', function($response) {
	if ($json = @json_encode($response->content)) {
		$response->content = $json;
		return $response;
	} else {
		return $response->mutate('string');
	}
});