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 |
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| 13 | class TVSeason extends Item implements TVSeasonInterface |
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| 14 | { |
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| 15 | |||
| 16 | use ElementTrait; |
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| 17 | |||
| 18 | protected $season_number; |
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| 19 | |||
| 20 | /** |
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| 21 | * Constructor |
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| 22 | * @param \vfalies\tmdb\Tmdb $tmdb |
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| 23 | * @param int $tv_id |
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| 24 | * @param int $season_number |
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| 25 | * @param array $options |
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| 26 | * @throws Exception |
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| 27 | */ |
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| 28 | 33 | public function __construct(Tmdb $tmdb, $tv_id, $season_number, array $options = array()) |
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| 34 | |||
| 35 | 2 | public function getId() |
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| 43 | |||
| 44 | 2 | public function getAirDate() |
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| 52 | |||
| 53 | 2 | public function getEpisodeCount() |
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| 61 | |||
| 62 | 2 | public function getSeasonNumber() |
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| 70 | |||
| 71 | 20 | public function getEpisodes() |
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| 82 | |||
| 83 | 2 | public function getName() |
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| 91 | |||
| 92 | 2 | public function getOverview() |
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| 100 | |||
| 101 | 1 | View Code Duplication | public function getPosters() |
| 111 | |||
| 112 | } |
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| 113 |
Let’s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let’s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: