All of J4 is now namespaced. If you don't know what a namespace is you are going to have to become familiar with it so do some research.


J4 has dropped almost all class names that start with J such as JText and replaced them with class names that don't include the J, so Text instead of JText. In order to use these new class names you must insert a use statement at the top of your PHP file to tell PHP how to find the class called Text. For our example Text, the statement is:


use Joomla\CMS\Language\Text;


More on this topic follows.