Rule lambda_not_used_import Lambda must not import variables it doesn't use. Examples Example #1 --- Original +++ New <?php -$foo = function() use ($bar) {}; +$foo = function() {}; Rule sets The rule is part of the following rule sets: @PhpCsFixer @Symfony Source class PhpCsFixer\Fixer\FunctionNotation\LambdaNotUsedImportFixer