Extendable responses

Error.php

<?php

use Tonic\Response;

abstract class Error extends Response
{
	public function output()
	{
		$this->body = ['code' => $this->responseCode(), 'message' => $this->responseMessage() ];
		$this->body = json_encode($this->body);

		$this->contentType = 'application/json';

		return parent::output();
	}
}

index.php

<?php

try {
    // ...

} catch (\Tonic\NotFoundException $e) {
    $response = new Responses\NotFound;

} catch (\Exception $e) {
    $response = new Responses\InternalServerError;
}

NotFound.php

<?php

class NotFound extends Error
{
	public $code = self::NOTFOUND;
}