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Rule ``assign_null_coalescing_to_coalesce_equal``
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Use the null coalescing assignment operator ``??=`` where possible.

Examples
--------

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

.. code-block:: diff

   --- Original
   +++ New
    <?php
   -$foo = $foo ?? 1;
   +$foo ??= 1;

Rule sets
---------

The rule is part of the following rule sets:

- `@PHP74Migration <./../../ruleSets/PHP74Migration.rst>`_
- `@PHP80Migration <./../../ruleSets/PHP80Migration.rst>`_
- `@PHP81Migration <./../../ruleSets/PHP81Migration.rst>`_
- `@PHP82Migration <./../../ruleSets/PHP82Migration.rst>`_