How to create basic Error logging in Mezzio v3

Sorry if this is a too simple thing to ask for here. but i am stuck here and flooded with all the information available , where I am only trying to write a basic error logging mechanism that logs all my PHP errors and exception to a log file as of now i am using Zend server and Z-ray is enabled which is the only way for displaying the errors on the Z-ray bar.

Also throw me some light on Errorlistener and Delegators . Can it be used to log error, tried to implement it but no luck.


namespace App\ErrorListner;

use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Log\LoggerInterface;
use Throwable;

class LoggingErrorListener 

    private const LOG_STRING = '{status} [{method}] {uri}: {error}';
    private $logger;

    public function __construct(LoggerInterface $logger)
        $this->logger = $logger;

    public function __invoke(
        Throwable $error,
        ServerRequestInterface $request,
        ResponseInterface $response
    ) {

                (string) $request->getUri(),


namespace App\ErrorListner;

use Laminas\Stratigility\Middleware\ErrorHandler;
use Psr\Container\ContainerInterface;
use Psr\Log\LoggerInterface;

class LoggingErrorListenerDelegator
    public function __invoke(ContainerInterface $container,string $serviceName,callable $callback): ErrorHandler
        $errorHandler = $callback();
        new LoggingErrorListener($container->get(LoggerInterface::class))
        return $errorHandler;

ConfigProvider.php i have added this

'delegators' => [
			ErrorHandler::class => [

And how to test if the delegator is working. because right now i think it is not getting detected.

Not sure if this is the only missing piece, but you might be missing the following in pipeline.php:


// use statements here ...

return function (Application $app, MiddlewareFactory $factory, ContainerInterface $container): void {
    /** @var ErrorHandler $errorHandler */
    $errorHandler = $container->get(ErrorHandler::class);
    $errorHandler->attachListener(function (Throwable $throwable, ServerRequestInterface $request, ResponseInterface $response): void {
        _log()->err($throwable->getMessage() . "\n" . $throwable->getTraceAsString());

    // The error handler should be the first (most outer) middleware to catch
    // all Exceptions.

    // all other stuff here ....

To test it, you should be able to throw any exception in one of your middleware.

1 Like

the better way I found to build my own log, was build a module that handle it with laminas-log,
in my case I build a middleware to log all incoming request, and a Model to write logs when need to.
if you need, ask for my code.

Share your code of using own log on mezzio. Also share the possibility to log sql queries as well through that if you aware