It would be nice if something like this could be possible: ```php html_build_attributes( [ 'id' => 'post' 'class' => [ 'post', 'post--no-sidebar' => ! $has_sidebar, 'post--no-thumb' => ! $has_thumb, ], ] ); ``` I mean, that it would be possible to set as an attribute value an associative array, where elements that are `false`, `null`, etc. are excluded.