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Added a note about deprecating addClassesToCompile() #7819

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Added a note about deprecating addClassesToCompile() #7819

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8 changes: 3 additions & 5 deletions bundles/extension.rst
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Expand Up @@ -129,11 +129,9 @@ read more about it, see the ":doc:`/bundles/configuration`" article.
Adding Classes to Compile
-------------------------

.. note::

The ``addClassesToCompile()`` method was deprecated in Symfony 3.3, and will
be removed in Symfony 4.0. If you want to use this method and be compatible
with Symfony 4.0, check to see if the method exists before calling it.
.. versionadded:: 3.3
This technique is discouraged and the ``addClassesToCompile()`` method was
deprecated in Symfony 3.3 because modern PHP versions make it unnecessary.

Symfony creates a big ``classes.php`` file in the cache directory to aggregate
the contents of the PHP classes that are used in every request. This reduces the
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