4.4 to 5.0
An explanation of the code changes for each version of Joomla. If you follow from the version of your current code until the version you want to support you should come across all the changes you need to make.
Most of the code deprecated in Joomla! 3.x has been removed. Some deprecations have been moved to the Compatibility Plugin.
Replacement of Factory::getUser
Factory::getUser() is deprecated since Joomla 4.0. To replace it, models, views, form fields and tables can implement the
CurrentUserInterface and then is the currently logged in user available through
In 5.0 are all the template files (default.php) changed from
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Form field classes
There is a long list of old style form field classes that have no equivalent in Joomla 5. For example:
In Joomla 5 the namespaced classes are:
The namespaced version is not available in Joomla 3. If you want to run your extension on both Joomla 3 and Joomla 5 without the compatibility plugin you will have to refactor the use of these form field classes to use your own.