.. include:: /Includes.rst.txt .. _deprecation-63974: ============================================================== Deprecation: #63974 - Deprecate CSS compressor callback method ============================================================== See :issue:`63974` Description =========== The callback method `compressCssPregCallback()` as defined in EXT:core/Classes/Resource/ResourceCompressor.php has been marked as deprecated due to the overhauled regular expressions. Impact ====== Usage of the mentioned method is discouraged and will break as of CMS 8. Affected installations ====================== All installations or extensions using the `compressCssPregCallback()` callback method. Migration ========= No migration possible for the callback method. .. index:: PHP-API