Joomla! Documentation™

At Joomla! 3.4, the PHPUTF8 library lived in two locations in the Joomla! package; `libraries/phputf8` and `libraries/vendor/joomla/string/src/phputf8`. In Joomla! 4.0, the copy of the library in `libraries/phputf8` has been removed. The Joomla\String\StringHelper class exposes many of the library's functions and the Composer autoloader definition imports much of the library as well, however, if you need a feature that is not already included then you should import the required functions from the `libraries/vendor/joomla/string/src/phputf8` path.