doc/rules/language_construct/is_null.rst
is_nullReplaces is_null($var) expression with null === $var.
This rule is RISKY
Risky when the function ``is_null`` is overridden.
Examples
--------
Example #1
~~~~~~~~~~
.. code-block:: diff
--- Original
+++ New
<?php
-$a = is_null($b);
+$a = null === $b;
Rule sets
---------
The rule is part of the following rule sets:
- `@PhpCsFixer:risky <./../../ruleSets/PhpCsFixerRisky.rst>`_
- `@Symfony:risky <./../../ruleSets/SymfonyRisky.rst>`_
References
----------
- Fixer class: `PhpCsFixer\\Fixer\\LanguageConstruct\\IsNullFixer <./../../../src/Fixer/LanguageConstruct/IsNullFixer.php>`_
- Test class: `PhpCsFixer\\Tests\\Fixer\\LanguageConstruct\\IsNullFixerTest <./../../../tests/Fixer/LanguageConstruct/IsNullFixerTest.php>`_
The test class defines officially supported behaviour. Each test case is a part of our backward compatibility promise.