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Rule ``standardize_not_equals``
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Replace all ``<>`` with ``!=``.

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

.. code-block:: diff

   --- Original
   +++ New
    <?php
   -$a = $b <> $c;
   +$a = $b != $c;

Rule sets
---------

The rule is part of the following rule sets:

- `@PhpCsFixer <./../../ruleSets/PhpCsFixer.rst>`_
- `@Symfony <./../../ruleSets/Symfony.rst>`_