Compatibility Plugin

Developer Note

Since this version of Joomla has not been released yet, this page can change anytime.

Update Needed

No decision has made yet what's happening to this plugin in Joomla 6.0

As part of Joomla! 5.0 a plugin was introduced which enhance backward compatibility between Joomla 5 and 4. The plugin is implemented as "Behaviour" plugin type to guarantee that is loaded before any other plugin is loaded. (Just a heads-up, don't create a plugin as behaviour plugin because it's possible that this group get removed at some point)

For more detail check Compatibility Plugin Joomla! 5.0.

CMS BaseApplication and CLI classes

• PR's:
  • https://github.com/joomla/joomla-cms/pull/42884
  • https://github.com/joomla/joomla-cms/pull/44926
• Description: Any reference to the class \Joomla\CMS\Application\BaseApplication and \Joomla\CMS\Application\CliApplication with the respective CLI input classes should be replaced with the namespace \Joomla\Application. Cli apps should be replaced by console plugins.

JPATH_PLATFORM constant

• PR: https://github.com/joomla/joomla-cms/pull/44638
• File: All bootstrapping files
• Description: The JPATH_PLATFORM is an old constant and should not be used if the Joomla core got correctly bootstrapped. Change your checks to _JEXEC

// Old:
\defined('JPATH_PLATFORM') or die;

// New:
\defined('_JEXEC') or die;