is_null.rst

Rule is_null

Replaces is_null($var) expression with null === $var.

Warning

Using this rule is risky.

Risky when the function is_null is overridden.

Examples

Example #1

--- Original
+++ New
 <?php
-$a = is_null($b);
+$a = null === $b;

Rule sets

The rule is part of the following rule sets:

@PhpCsFixer:risky

Using the @PhpCsFixer:risky rule set will enable the is_null rule.

@Symfony:risky

Using the @Symfony:risky rule set will enable the is_null rule.