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 | ||
| 14 | class UserController extends Controller | ||
| 15 | { | ||
| 16 | /** | ||
| 17 | * Constructor | ||
| 18 | */ | ||
| 19 | public function __construct() | ||
| 30 | |||
| 31 | /** | ||
| 32 | * Show all the users. | ||
| 33 | * | ||
| 34 | * @return \Illuminate\View\View | ||
| 35 | */ | ||
| 36 | public function index(): View | ||
| 40 | |||
| 41 | /** | ||
| 42 | * Show the user profile page. | ||
| 43 | * | ||
| 44 | * @return \Illuminate\Http\RedirectResponse|\Illuminate\View\View | ||
| 45 | */ | ||
| 46 | public function show(Request $request, $slug, $id) | ||
| 69 | |||
| 70 | /** | ||
| 71 | * Show the settings form. | ||
| 72 | * | ||
| 73 | * @return \Illuminate\View\View | ||
| 74 | */ | ||
| 75 | public function showSettingsForm(): View | ||
| 83 | |||
| 84 | /** | ||
| 85 | * Handle an update request for the user. | ||
| 86 | * | ||
| 87 | * @param \Illuminate\Http\Request $request | ||
| 88 | * | ||
| 89 | * @return \Illuminate\Http\RedirectResponse | ||
| 90 | */ | ||
| 91 | public function update(Request $request): RedirectResponse | ||
| 111 | |||
| 112 | /** | ||
| 113 | * Handle the delete request for the user. | ||
| 114 | * | ||
| 115 | * @param \Illuminate\Http\Request $request | ||
| 116 | * | ||
| 117 | * @return \Illuminate\Http\RedirectResponse | ||
| 118 | */ | ||
| 119 | public function delete(Request $request): RedirectResponse | ||
| 140 | |||
| 141 | /** | ||
| 142 | * Handle a E-mail update request for the user. | ||
| 143 | * | ||
| 144 | * @param \Illuminate\Http\Request $request | ||
| 145 | * | ||
| 146 | * @return \Illuminate\Http\RedirectResponse | ||
| 147 | */ | ||
| 148 | protected function updateEmail(Request $request): RedirectResponse | ||
| 157 | |||
| 158 | /** | ||
| 159 | * Handle a Password update request for the user. | ||
| 160 | * | ||
| 161 | * @param \Illuminate\Http\Request $request | ||
| 162 | * | ||
| 163 | * @return \Illuminate\Http\RedirectResponse | ||
| 164 | */ | ||
| 165 | protected function updatePassword(Request $request): RedirectResponse | ||
| 182 | } | ||
| 183 | 
This checks looks for assignemnts to variables using the
list(...)function, where not all assigned variables are subsequently used.Consider the following code example.
Only the variables
$aand$care used. There was no need to assign$b.Instead, the list call could have been.