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 declare(strict_types = 1); |
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| 8 | class Expression |
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| 9 | { |
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| 10 | /** @var array */ |
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| 11 | private $queryPartial; |
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| 12 | |||
| 13 | /** |
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| 14 | * Expression constructor. |
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| 15 | */ |
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| 16 | public function __construct() |
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| 20 | |||
| 21 | /** |
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| 22 | * @param array|Expression $expression |
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| 23 | * |
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| 24 | * @return $this |
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| 25 | */ |
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| 26 | View Code Duplication | public function and($expression) |
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| 42 | |||
| 43 | /** |
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| 44 | * @param array|Expression $expression |
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| 45 | * |
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| 46 | * @return $this |
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| 47 | */ |
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| 48 | View Code Duplication | public function or($expression) |
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| 64 | |||
| 65 | /** |
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| 66 | * @return array |
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| 67 | */ |
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| 68 | public function getQueryPartial(): array |
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| 72 | |||
| 73 | /** |
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| 74 | * @param string $operator |
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| 75 | */ |
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| 76 | private function prepareOperator(string $operator) |
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| 82 | } |
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| 83 |
This check looks from parameters that have been defined for a function or method, but which are not used in the method body.