如何在Symfony2/Silex中捕获错误和异常？

Question

我想在我的Silex应用程序中捕获错误和异常,将它们包装在一个自定义的JSON响应中,该响应将始终返回给客户端.我找到了三种基本方法:

$app->error()
Symfony\Component\Debug\ErrorHandler::register();
Symfony\Component\Debug\ExceptionHandler::register();

虽然我能够使用error()我的php错误来捕获控制器异常 - 但它们总是在xdebug中结束.我还没有理解如何error()与ExceptionHandler::register()每个其他-我需要两个互动？如何确保我的error()回复是JSON？

我现在有以下示例代码:

use Silex\Application;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

class Router extends Silex\Application
{
    function __construct() {
        parent::__construct();

        // routes
        $this->match('/{context}', array($this, 'handler'));

        // error handler
        $this->error(function(\Exception $e, $code) {
            return $this->json(array("error" => $e->getMessage()), $code);
        });
    }

    function handler(Request $request, $context) {
        // throw new \Exception('test'); // exception- this is caught
        $t = new Test(); // error- this is not caught

        return 'DONE';
    }
}

Symfony\Component\Debug\ErrorHandler::register();

$app = new Router();
$app->run();

Answer 1

使用ErrorHandler :: register(); 你可以像异常一样抓住你的错误

例

use Symfony\Component\Debug\ExceptionHandler;
use Symfony\Component\Debug\ErrorHandler;

///bla bla bla some code

//catch all errors and convert them to exceptions
ErrorHandler::register();

try {
    //for example error happens here
    trigger_error( 'OH MY GOD, I AM ON FIRE' );
} catch ( \Exception $e ) {

    //for debugging you can do like this
    $handler = new ExceptionHandler();
    $handler->handle( $e );

    /*
    * ExceptionHendler class comments
    * It is mostly useful in debug mode to replace the default PHP/XDebug
    * output with something prettier and more useful.
    * so i suggest to create json response
    * and replace this code $handler = new ExceptionHandler();
    * $handler->handle( $e );
    */
    return new JsonResponse(
        array(
            'status' => 'error', 
            'message' => $e->getMessage()
        )
    );
}

用silex你可以做下一件事

ErrorHandler::register();
//register an error handler
$app->error(function ( \Exception $e, $code ) use ($app) {

    //return your json response here
    $error = array( 'message' => $e->getMessage() );

    return $app->json( $error, 200 );
});