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Rule ``phpdoc_readonly_class_comment_to_keyword``
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Converts readonly comment on classes to the readonly keyword.

Warning
-------

Using this rule is risky
~~~~~~~~~~~~~~~~~~~~~~~~

If classes marked with ``@readonly`` annotation were extended anyway, applying
this fixer may break the inheritance for their child classes.

Examples
--------

Example #1
~~~~~~~~~~

.. code-block:: diff

   --- Original
   +++ New
        <?php
   -    /** @readonly */
   -    class C {
   +    
   +    readonly class C {
        }
