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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| 15 | abstract class BaseDns implements IDsn { |
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| 16 | /** @var string */ |
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| 17 | protected $dbName; |
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| 18 | |||
| 19 | /** @var string */ |
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| 20 | protected $host; |
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| 21 | |||
| 22 | /** @var int */ |
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| 23 | protected $port; |
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| 24 | |||
| 25 | /** |
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| 26 | * @param string $dbName |
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| 27 | * @return BaseDns|static |
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| 28 | * @throws EmptyArgumentException |
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| 29 | */ |
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| 30 | 8 | View Code Duplication | public function setDbName(string $dbName) : self { |
| 39 | |||
| 40 | /** |
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| 41 | * @return string |
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| 42 | */ |
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| 43 | 2 | public function getDbName() : string { |
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| 46 | |||
| 47 | /** |
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| 48 | * @param string $host |
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| 49 | * @return BaseDns|static |
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| 50 | * @throws EmptyArgumentException |
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| 51 | */ |
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| 52 | 8 | View Code Duplication | public function setHost(string $host) : self { |
| 61 | |||
| 62 | /** |
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| 63 | * @return string |
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| 64 | */ |
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| 65 | 2 | public function getHost() : string { |
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| 68 | |||
| 69 | /** |
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| 70 | * @param int $port |
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| 71 | * @return BaseDns|static |
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| 72 | * @throws WrongArgumentException |
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| 73 | */ |
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| 74 | 8 | public function setPort(int $port) : self { |
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| 83 | |||
| 84 | /** |
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| 85 | * @return int |
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| 86 | */ |
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| 87 | 2 | public function getPort() : int { |
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| 90 | |||
| 91 | /** |
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| 92 | * @return string |
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| 93 | */ |
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| 94 | 2 | public function __toString() : string { |
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| 97 | } |
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| 98 |
This check compares the return type specified in the
@returnannotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch.