Rule strict_comparison Comparisons should be strict. Warning Using this rule is risky Changing comparisons to strict might change code behavior. Examples Example #1 --- Original +++ New <?php -$a = 1== $b; +$a = 1=== $b; Rule sets The rule is part of the following rule set: @PhpCsFixer:risky Source class PhpCsFixer\Fixer\Strict\StrictComparisonFixer