.. _cannot-use-the-final-modifier-on-an-abstract-class:

Cannot use the final modifier on an abstract class
--------------------------------------------------
 
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	:description:
		Cannot use the final modifier on an abstract class: The options ``final`` and ``abstract`` are mutually exclusive.
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	:og:title: Cannot use the final modifier on an abstract class
	:og:description: The options ``final`` and ``abstract`` are mutually exclusive
	:og:url: https://php-errors.readthedocs.io/en/latest/messages/cannot-use-the-final-modifier-on-an-abstract-class.html
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Description
___________
 
The options ``final`` and ``abstract`` are mutually exclusive. The first one prevents any redefinition by children, while the second one requests an implementation, and as such, a redefinition, in children classes.

It is the same message, whatever the order of the options.

Example
_______

.. code-block:: php

   <?php
   
   final abstract class X {}
   
   abstract final class Z {}
   
   ?>

Solutions
_________

+ Drop the ``abstract`` option.
+ Drop the ``final`` option.
+ Drop both the options.

Changed Behavior
________________

This error may appear following an evolution in behavior, in previous versions. See ` <https://php-changed-behaviors.readthedocs.io/en/latest/behavior/.html>`_.