# Slim 4 - How to handle multiple errors

**URL:** <https://discourse.slimframework.com/t/slim-4-how-to-handle-multiple-errors/4878>\
**Category:** Questions\
**Created:** [June 29, 2021, 8:48am UTC](https://discourse.slimframework.com/t/slim-4-how-to-handle-multiple-errors/4878 "2021-06-29T08:48:04Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![philipp](https://avatars.discourse-cdn.com/v4/letter/p/46a35a/32.png) [@philipp](https://discourse.slimframework.com/u/philipp)\
**Post date:** [June 29, 2021, 8:48am UTC](https://discourse.slimframework.com/t/slim-4-how-to-handle-multiple-errors/4878/1 "2021-06-29T08:48:04Z")

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Hi there

I have an application which runs on Slim3 in production. Currently I’m working on upgrading to Slim4.  
I use an Error Handler and a Shutdown Handler as described in the Slim User Guide: [https://www.slimframework.com/docs/v4/objects/application.html#advanced-custom-error-handler](https://www.slimframework.com/docs/v4/objects/application.html#advanced-custom-error-handler)

The only difference is, that I use Twig and therefore I return a Twig-rendered HTML-String from the HttpErrorHandler. This works just fine.  
The Problem is, when I have for example a 404 the HttpErrorHandler outputs the correct Twig-rendered Error-Page to the browser. If additionally there is a PHP Error in the code, the ShutdownHandler is triggered, which invokes the HttpErrorHandler and then this outputs an additional Twig-rendered Error-Page to the browser.  
The second Error-Page is displayed under the first one in the browser.

At the moment I’m searching for ideas how to output only one error-page. Is it possible to detect the last error? Or can I suppress the output until the last error?

Thanks a lot for your support!

philipp

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**Author:** ![odan](https://avatars.discourse-cdn.com/v4/letter/o/9de053/32.png) [@odan](https://discourse.slimframework.com/u/odan)\
**Post date:** [June 29, 2021, 2:44pm UTC](https://discourse.slimframework.com/t/slim-4-how-to-handle-multiple-errors/4878/2 "2021-06-29T14:44:22Z")

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Hi @philipp

The shown [ShutdownHandler](https://www.slimframework.com/docs/v4/objects/application.html#advanced-shutdown-handler) uses its own (a second) ResponseEmitter, although there must be only one per request.

```php
// this will output the second page
$responseEmitter = new ResponseEmitter();
$responseEmitter->emit($response);

```

I suggest using a `ErrorHandlerMiddleware` instead to catch and handle all PHP errors, warnings, and notices. Here is the code: [Catching PHP warnings, notices and errors](https://odan.github.io/2020/05/27/slim4-error-handling.html#catching-php-warnings-notices-and-errors)

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**Author:** ![philipp](https://avatars.discourse-cdn.com/v4/letter/p/46a35a/32.png) [@philipp](https://discourse.slimframework.com/u/philipp)\
**Post date:** [June 30, 2021, 8:48am UTC](https://discourse.slimframework.com/t/slim-4-how-to-handle-multiple-errors/4878/3 "2021-06-30T08:48:57Z")

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Hi Daniel

Thanks a lot for your support! I really appreciate that.  
I implemented the ErrorHandlerMiddleware, like you suggested and it works like a charm.  
In the beginning I struggled a bit, because the errors were not logged. The problem was, that my test-code, which produced the php-warning was in my app.php. When I put the code in a controller, the warning was logged like expected.

The ErrorHandlerMiddleware is now combined with a custom ErrorHandler. So in case of php warnings and notices I get a log entry and a mail from monolog. If there’s an error, the ErrorHandler shows either a Twig 404 or a Twig Error page and logs the error.

Nomäl viele Dank und än Gruäss us Frauefäld