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Jan 2, 2020
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Update error_pages.rst #12849

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12 changes: 7 additions & 5 deletions controller/error_pages.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -193,17 +193,19 @@ To override non-HTML error output, the Serializer component needs to be installe
$ composer require serializer

The Serializer component has a built-in ``FlattenException`` normalizer
(``ProblemNormalizer``) and JSON/XML/CSV/YAML encoders. When your application
(:class:`Symfony\\Component\\Serializer\\Normalizer\\ProblemNormalizer`) and JSON/XML/CSV/YAML encoders. When your application
throws an exception, Symfony can output it in one of those formats. If you want
to change the output contents, create a new Normalizer that supports the
``FlattenException`` input::

# src/App/Serializer/MyCustomProblemNormalizer.php
namespace App\Serializer;

use Symfony\Component\Serializer\Normalizer\NormalizerInterface;

class MyCustomProblemNormalizer implements NormalizerInterface
{
public function normalize($exception, $format = null, array $context = [])
public function normalize($exception, string $format = null, array $context = [])
{
return [
'content' => 'This is my custom problem normalizer.',
Expand All @@ -214,7 +216,7 @@ to change the output contents, create a new Normalizer that supports the
];
}

public function supportsNormalization($data, $format = null)
public function supportsNormalization($data, string $format = null)
{
return $data instanceof FlattenException;
}
Expand Down Expand Up @@ -252,14 +254,14 @@ configuration option to point to it:
https://symfony.com/schema/dic/services/services-1.0.xsd">

<framework:config>
<framework:error_controller>App\Controller\ErrorController::showAction</framework:error_controller>
<framework:error-controller>App\Controller\ErrorController::showAction</framework:error-controller>
</framework:config>

</container>

.. code-block:: php

// config/packages/twig.php
// config/packages/framework.php
$container->loadFromExtension('framework', [
'error_controller' => 'App\Controller\ErrorController::showAction',
// ...
Expand Down