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 | ||
| 41 | class Factory { | ||
| 42 | /** @var IManager */ | ||
| 43 | protected $activityManager; | ||
| 44 | |||
| 45 | /** @var IUserManager */ | ||
| 46 | protected $userManager; | ||
| 47 | |||
| 48 | /** @var IContactsManager */ | ||
| 49 | protected $contactsManager; | ||
| 50 | |||
| 51 | /** @var IL10N */ | ||
| 52 | protected $l; | ||
| 53 | |||
| 54 | /** @var IGroupManager */ | ||
| 55 | protected $groupManager; | ||
| 56 | |||
| 57 | /** @var ViewInfoCache */ | ||
| 58 | protected $infoCache; | ||
| 59 | |||
| 60 | /** @var string */ | ||
| 61 | protected $user; | ||
| 62 | |||
| 63 | /** @var IURLGenerator */ | ||
| 64 | protected $urlGenerator; | ||
| 65 | |||
| 66 | /** | ||
| 67 | * @param IManager $activityManager | ||
| 68 | * @param IUserManager $userManager | ||
| 69 | * @param IURLGenerator $urlGenerator | ||
| 70 | * @param IContactsManager $contactsManager | ||
| 71 | * @param ViewInfoCache $infoCache, | ||
|  | |||
| 72 | * @param IL10N $l | ||
| 73 | * @param string $user | ||
| 74 | */ | ||
| 75 | 21 | View Code Duplication | public function __construct(IManager $activityManager, | 
| 92 | |||
| 93 | /** | ||
| 94 | * @param string $user | ||
| 95 | */ | ||
| 96 | 7 | 	public function setUser($user) { | |
| 99 | |||
| 100 | /** | ||
| 101 | * @param IL10N $l | ||
| 102 | */ | ||
| 103 | 1 | 	public function setL10n(IL10N $l) { | |
| 106 | |||
| 107 | /** | ||
| 108 | * @param string $parameter | ||
| 109 | * @param IEvent $event | ||
| 110 | * @param string $formatter | ||
| 111 | * @return IParameter | ||
| 112 | */ | ||
| 113 | 6 | 	public function get($parameter, IEvent $event, $formatter) { | |
| 121 | |||
| 122 | /** | ||
| 123 | * @return Collection | ||
| 124 | */ | ||
| 125 | 1 | 	public function createCollection() { | |
| 128 | |||
| 129 | /** | ||
| 130 | * @param string $formatter | ||
| 131 | * @return IFormatter | ||
| 132 | */ | ||
| 133 | 9 | 	protected function getFormatter($formatter) { | |
| 146 | } | ||
| 147 | 
This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function. It has, however, found a similar but not annotated parameter which might be a good fit.
Consider the following example. The parameter
$irelandis not defined by the methodfinale(...).The most likely cause is that the parameter was changed, but the annotation was not.