is_null
Replaces is_null($var) expression with null === $var.
is_null($var)
null === $var
Risky when the function is_null is overridden.
--- Original +++ New <?php -$a = is_null($b); +$a = null === $b;
The rule is part of the following rule sets:
Using the @PhpCsFixer:risky rule set will enable the is_null rule.
Using the @Symfony:risky rule set will enable the is_null rule.