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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>`_
- `@PHP83Migration <./../../ruleSets/PHP83Migration.rst>`_

References
----------

- Fixer class: `PhpCsFixer\\Fixer\\Operator\\AssignNullCoalescingToCoalesceEqualFixer <./../../../src/Fixer/Operator/AssignNullCoalescingToCoalesceEqualFixer.php>`_
- Test class: `PhpCsFixer\\Tests\\Fixer\\Operator\\AssignNullCoalescingToCoalesceEqualFixerTest <./../../../tests/Fixer/Operator/AssignNullCoalescingToCoalesceEqualFixerTest.php>`_

The test class defines officially supported behaviour. Each test case is a part of our backward compatibility promise.
