Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
| 1 | <?php | ||
| 22 | View Code Duplication | class AddCollapseIdHeaderVisitor implements HttpProtocolVisitorInterface | |
| 23 | { | ||
| 24 | /** | ||
| 25 |      * {@inheritdoc} | ||
| 26 | */ | ||
| 27 | public function visit(Notification $notification, Request $request): Request | ||
| 37 | } | ||
| 38 |