Rule array_indentation Each element of an array must be indented exactly once. Examples Example #1 --- Original +++ New <?php $foo = [ - 'bar' => [ - 'baz' => true, - ], + 'bar' => [ + 'baz' => true, + ], ]; Rule sets The rule is part of the following rule set: @PhpCsFixer Source class PhpCsFixer\Fixer\Whitespace\ArrayIndentationFixer