Deprecation: #55419 - Streamline file conflict mode handling

See forge#55419


Conflicts in file names and folder names when uploading new files or creating new folders are now handled uniformly with constants within the core. Therefore a new enumeration has been introduced to provide the available values: \TYPO3\CMS\Core\Resource\DuplicationBehavior.

Provided constants are:

  • DuplicationBehavior::CANCEL

  • DuplicationBehavior::REPLACE

  • DuplicationBehavior::RENAME

Before this change there were two sets of strings used to define the behavior upon conflicts.

  • Set1: cancel, replace and changeName

  • Set2: cancel, overrideExistingFile and renameNewFile

As they are redundant they are now represented by a new set of constants:


All usages of strings of the former sets have been replaced with their counterparts from the new set. In the enumeration the former values have been mapped to the new values and marked for deprecation.


Using changeName, overrideExistingFile or renameNewFile for file conflict handling will result in a deprecation log entry.

Affected Installations

All third party code that calls one of the listed methods with $conflictMode either set to changeName, overrideExistingFile or renameNewFile.


Use the provided enumeration \TYPO3\CMS\Core\Resource\DuplicationBehavior instead.


$resourceStorage->copyFile($file, $targetFolder, 'target-file-name', DuplicationBehavior::RENAME);