Deprecation: #95317 - Legacy syntax for IRRE localize synchronize command in DataHandler

See Issue #95317

Description

The DataHandler command “inlineLocalizeSynchronize” now triggers a warning if the incoming command payload is sent as comma-separated list rather than an array.

The array allows to synchronize/localize multiple values at once, which is preferred since TYPO3 v7.6, and used in TYPO3 properly since then.

Impact

Calling DataHandler process_cmdmap with an incoming command for “inlineLocalizeSynchronize” with a payload of comma-separated values will trigger a PHP deprecation warning.

Affected Installations

TYPO3 installations with custom code related to DataHandler and modifying the “inlineLocalizeSynchronize” command, which is highly unlikely. This only affects special handling of “inline” configuration fields.

Migration

See “Important-71126-AllowToDefineMultipleInlineLocalizeSynchronizeCommands.rst” for further information on how to migrate your incoming DataHandler command.