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7th Gear (v3.57.2) edition

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:

References

The test class defines officially supported behaviour. Each test case is a part of our backward compatibility promise.