Why is Slim Framework's phpErrorHandler not working?

Question

I'm having trouble getting the phpErrorHandler to work. I'm using the latest version of Slim and my server is running PHP 7.1.

use \Slim\App as App;
use \Psr\Http\Message\ServerRequestInterface as Request;
use \Psr\Http\Message\ResponseInterface as Response;

$app = new App([
    'errorHandler' => function ($c) {
        return function ($request, $response, $error) use ($c) {
            return $c['response']
                ->withStatus(500)
                ->withHeader('Content-Type', 'text/html')
                ->write('application error');
        };
    },
    'phpErrorHandler' => function ($c) {
        return function ($request, $response, $error) use ($c) {
            return $c['response']
                ->withStatus(500)
                ->withHeader('Content-Type', 'text/html')
                ->write('runtime error');
        };
    }
]);

When I throw an Exception from my code, the error handler is invoked and my output is "application error". However, when I throw an Error from my code or introduce syntax errors, the phpErrorHandler is not invoked and, depending on my settings, PHP produces an error message with a stacktrace.

I've tried to add

ini_set('display_errors', 0); // do not produce the standard output when an error occurs
error_reporting(-1); // enable error reporting (is this required for Slim?)

But any changes that I make in that configuration doesn't seem to affect whether or not my closure is invoked.

-edit-

I tried to execute a piece of Javascript that logs to the console. That works for the errorHandler, not for the phpErrorHandler. Also a simple

die('oops');

doesn't do anything in phpErrorHandler. It appears that the callback isn't invoked at all.

If I put a try/catch around

$app->run();

I am able to catch errors. However, this causes some nasty side-effects that I prefer to avoid. What that tells me though, is that it's not a config setting that keeps me from catching errors.

My system setup is PHP 7.1. I can not reproduce your problem. Throwing `Exception` or `Error` both triggers `phpErrorHandler` handler because both classes implement `Throwable` interface. — Zamrony P. Juhara, Apr 06 '18 at 02:30
my guess is the `$c['response']` is not the same as the `$response` param the function receives; try with that — zedling, Apr 08 '18 at 10:56

score 2 · Answer 1 · edited Feb 12 '19 at 18:53

2

I had this same issue and was slightly led astray by the Slim 3 documentation which mentions the phpErrorHandler feature. However, phpErrorHandler was not added into Slim until version 3.2.0: https://github.com/slimphp/Slim/releases/tag/3.2.0

If you are using Slim version < 3.2.0, try upgrading.

edited Feb 12 '19 at 18:53

Blue

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answered Feb 12 '19 at 18:51

user1652182

21
3

score 0 · Answer 2 · answered Jan 22 '19 at 04:27

maybe try to disable display_startup_errors ?

my config:

error_reporting(E_ALL);
ini_set("display_errors", 0);
ini_set('display_startup_errors', 0);

EDIT: also die('oops'); is not an error, it will just die/exit execution of script, nothing after that will be executed

Why is Slim Framework's phpErrorHandler not working?

2 Answers2