After upgrading to 10.3.2 our functional test suites started to break on PHP 8.1 with an exception triggered by an E_DEPRECATED level of warning.
Exception: Deprecated function: explode(): Passing null to parameter #2 ($string) of type string is deprecated
Drupal\file\Plugin\Field\FieldFormatter\FileMediaFormatterBase::mimeTypeApplies()() (Line: 171)
/mnt/files/local_mount/build/web/core/lib/Drupal/Core/Test/HttpClientMiddleware/TestHttpClientMiddleware.php:55
/mnt/files/local_mount/build/vendor/guzzlehttp/promises/src/Promise.php:209
/mnt/files/local_mount/build/vendor/guzzlehttp/promises/src/Promise.php:158
/mnt/files/local_mount/build/vendor/guzzlehttp/promises/src/TaskQueue.php:52
/mnt/files/local_mount/build/vendor/guzzlehttp/promises/src/Promise.php:251
/mnt/files/local_mount/build/vendor/guzzlehttp/promises/src/Promise.php:227
/mnt/files/local_mount/build/vendor/guzzlehttp/promises/src/Promise.php:272
/mnt/files/local_mount/build/vendor/guzzlehttp/promises/src/Promise.php:229
/mnt/files/local_mount/build/vendor/guzzlehttp/promises/src/Promise.php:69
/mnt/files/local_mount/build/vendor/guzzlehttp/guzzle/src/Client.php:189
/mnt/files/local_mount/build/web/core/tests/Drupal/Tests/DrupalTestBrowser.php:139
/mnt/files/local_mount/build/vendor/symfony/browser-kit/AbstractBrowser.php:385
/mnt/files/local_mount/build/vendor/behat/mink-browserkit-driver/src/BrowserKitDriver.php:122
/mnt/files/local_mount/build/vendor/behat/mink/src/Session.php:175
/mnt/files/local_mount/build/web/core/tests/Drupal/Tests/UiHelperTrait.php:260
/mnt/files/local_mount/drupal/modules/foo/tests/src/Functional/Bar.php:66
It seems that currently there is no (good) way to fix this problem because E_DEPRECATED level warnings ALWAYS triggers and exception via \_drupal_log_error() line 162:
// When running inside the testing framework, we relay the errors
// to the tested site by the way of HTTP headers.
if (DRUPAL_TEST_IN_CHILD_SITE && !headers_sent() && (!defined('SIMPLETEST_COLLECT_ERRORS') || SIMPLETEST_COLLECT_ERRORS)) {
_drupal_error_header($error['@message'], $error['%type'], $error['%function'], $error['%file'], $error['%line']);
}
SYMFONY_DEPRECATIONS_HELPER=disabled has no impact on this because the exception is triggered and caught by the browser in the test.
In 🐛 Drupal overriding error_reporting setting in php.ini Needs work we already started to explore the issues with Drupal core's current error handling configuration and how it makes environment specific overrides complicated.
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Related Drupal Slack conversation: https://drupal.slack.com/archives/C223PR743/p1723130408891959
The E_DEPRECATED warning is caused by 🐛 Deprecated function: explode(): Passing null to parameter #2 ($string) of type string is deprecated in Drupal\file\Plugin\Field\FieldFormatter\FileMediaFormatterBase::mimeTypeApplies() (line 171 of Plugin/Field/FieldFormatter/FileMediaFormatterBase.php) Needs work .