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MatthiasKuehneEllerhold
Feb 24, 2026

Symfony version(s) affected

7.4

Description

Upgrading my project to Symfony 8.0 lead to a lot of broken code. I didnt know why, because I never got any deprecations.
Ive set error_reporting(E_ALL) and used the Monolog log handler to write everything to file.
Nothing pops up.
I've registered the logger via Monolog\ErrorHandler::register($logger).

In the Symfony\Component\Console\Application line 558 (in v7.4) a function called trigger_deprecation() is called which should have notified me, that my code will be broken in 8.0, but I never got it!
Turns out: trigger_deprecation() executes @trigger_error().
The monolog error handle compares the (new) value of error_reporting() to E_USER_DEPRECATED and wont log it to file. Because with the @ the error_reporting() is now set to 4437 (instead of E_ALL) before!

So every deprecation CANT get logged with monolog! They only way to get them to log is NOT using Monolog\ErrorHandler::register($logger), instead use this:

$handler = new ErrorHandler($logger);
$handler->registerErrorHandler(handleOnlyReportedErrors: false);
$handler->registerExceptionHandler();
$handler->registerFatalHandler();

How to reproduce

require_once 'vendor/autoload.php';

$logger = new \Monolog\Logger(
    'logger',
    [new \Monolog\Handler\StreamHandler(__DIR__ . '/error.log', \Monolog\Logger::DEBUG)]
);

// DOES NOT LOG ANYTHING:
\Monolog\ErrorHandler::register($logger);

// INSTEAD USE THIS:
$handler = new \Monolog\ErrorHandler($logger);
$handler->registerErrorHandler(handleOnlyReportedErrors: false);

$application = new \Symfony\Component\Console\Application();
$application->add(new \Symfony\Component\Console\Command\Command('abc'));

Possible Solution

No response

Additional Context

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Replies: 3 comments

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nicolas-grekas
Feb 24, 2026
Maintainer

You need to configure a depreciation channel, see https://github.com/symfony/recipes/blob/main/symfony/monolog-bundle/3.7/config/packages/monolog.yaml as a start
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stof
Feb 24, 2026
Collaborator

you should not register the Monolog ErrorHandler, as this would replace the error handler registered by symfony/error-handler
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MatthiasKuehneEllerhold
Feb 24, 2026
Author

Sorry forgot to say: Im not using the symfony framework. So no bundles etc.

Im using these packages independently:

monolog/monolog                                  3.10.0                                                            Sends your logs to files, sockets, inboxes, databases and various web services
symfony/console                                  7.4.4                                                             Eases the creation of beautiful and testable command line interfaces
symfony/css-selector                             8.0.0                                                             Converts CSS selectors to XPath expressions
symfony/deprecation-contracts                    3.6.0                                                             A generic function and convention to trigger deprecation notices
symfony/event-dispatcher                         8.0.4                                                             Provides tools that allow your application components to communicate with each other by dispatching events and listening to them
symfony/event-dispatcher-contracts               3.6.0                                                             Generic abstractions related to dispatching event
symfony/filesystem                               8.0.1                                                             Provides basic utilities for the filesystem
symfony/ldap                                     8.0.4                                                             Provides a LDAP client for PHP on top of PHP's ldap extension
symfony/mailer                                   8.0.4                                                             Helps sending emails
symfony/mime                                     8.0.5                                                             Allows manipulating MIME messages
symfony/options-resolver                         8.0.0                                                             Provides an improved replacement for the array_replace PHP function
symfony/polyfill-intl-idn                        1.33.0                                                            Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions
symfony/process                                  8.0.5                                                             Executes commands in sub-processes
symfony/service-contracts                        3.6.1                                                             Generic abstractions related to writing services
symfony/stopwatch                                8.0.0                                                             Provides a way to profile code
symfony/string                                   8.0.4                                                             Provides an object-oriented API to strings and deals with bytes, UTF-8 code points and grapheme clusters in a unified way
symfony/var-exporter                             8.0.0                                                             Allows exporting any serializable PHP data structure to plain PHP code
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@MatthiasKuehneEllerhold @nicolas-grekas @stof
Converted from issue

This discussion was converted from issue #63479 on February 24, 2026 13:44.

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