Rule array_push Converts simple usages of array_push($x, $y); to $x[] = $y;. Warning Using this rule is risky Risky when the function array_push is overridden. Examples Example #1 --- Original +++ New <?php -array_push($x, $y); +$x[] = $y; Rule sets The rule is part of the following rule sets: @PhpCsFixer:risky @Symfony:risky Source class PhpCsFixer\Fixer\Alias\ArrayPushFixer