Breaking: #88799 - Introduced PSR-3 compatible Logging API

See forge#88799


With the adaption of the PSR-3 standard some PHP code had to be changed in order to reach compliance. The key difference is that log levels are now represented by strings rather than numbers. Note that the order of log levels is not affected and stays the same.

The breaking changes mostly affect internal functionality and should not apply to third-party extensions.


The class \TYPO3\CMS\Core\Log\LogLevel now extends from the PSR-3 base class and therefore inherits the new definition of the log levels (EMERGENCY to DEBUG) based on string values.

The signatures of following methods have been adjusted to accept the new LogLevel::* constants:

  • \TYPO3\CMS\Core\Log\Logger::addWriter
  • \TYPO3\CMS\Core\Log\Logger::addProcessor

The internal storage of the log level inside \TYPO3\CMS\Core\Log\LogRecord has been adjusted, consequently the methods

  • setLevel() and
  • getLevel()

respectively accept and return string values now.

In case you have configured own logger or log targets, you have to adjust the integer level and use strings.


# old configuration
$GLOBALS['TYPO3_CONF_VARS']['LOG']['TYPO3']['CMS']['Core']['writerConfiguration'] = [
   7 => [
      \TYPO3\CMS\Core\Log\Writer\FileWriter::class => [
         'logFile' => 'typo3temp/var/log/core.log'

# new configuration
$GLOBALS['TYPO3_CONF_VARS']['LOG']['TYPO3']['CMS']['Core']['writerConfiguration'] = [
   'debug' => [
      \TYPO3\CMS\Core\Log\Writer\FileWriter::class => [
         'logFile' => 'typo3temp/var/log/core.log'

In case you have used the constants like LogLevel::DEBUG you are fine and your config will work like before.

Affected Installations

Any installation using third-party extensions interacting with the internals of the Logging API.


There are two easy ways to convert the integer to the string representation and vice versa:

  • Convert from integer to string: $logLevel = LogLevel::getInternalName($logLevelAsNumber)
  • Convert from string to integer: $logLevelAsNumber = LogLevel::normalizeLevel($logLevel)