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Rule ``ternary_to_null_coalescing``
===================================

Use ``null`` coalescing operator ``??`` where possible. Requires PHP >= 7.0.

Examples
--------

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

.. code-block:: diff

   --- Original
   +++ New
    <?php
   -$sample = isset($a) ? $a : $b;
   +$sample = $a ?? $b;

Rule sets
---------

The rule is part of the following rule sets:

@PHP70Migration
  Using the `@PHP70Migration <./../../ruleSets/PHP70Migration.rst>`_ rule set will enable the ``ternary_to_null_coalescing`` rule.

@PHP71Migration
  Using the `@PHP71Migration <./../../ruleSets/PHP71Migration.rst>`_ rule set will enable the ``ternary_to_null_coalescing`` rule.

@PHP73Migration
  Using the `@PHP73Migration <./../../ruleSets/PHP73Migration.rst>`_ rule set will enable the ``ternary_to_null_coalescing`` rule.

@PHP74Migration
  Using the `@PHP74Migration <./../../ruleSets/PHP74Migration.rst>`_ rule set will enable the ``ternary_to_null_coalescing`` rule.

@PHP80Migration
  Using the `@PHP80Migration <./../../ruleSets/PHP80Migration.rst>`_ rule set will enable the ``ternary_to_null_coalescing`` rule.