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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| 11 | class PriorityQueueCallbacks extends \SplPriorityQueue |
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| 12 | { |
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| 13 | use \PHPDaemon\Traits\ClassWatchdog; |
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| 14 | use \PHPDaemon\Traits\StaticObjectWatchdog; |
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| 15 | |||
| 16 | /** |
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| 17 | * Insert callback |
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| 18 | * @param callable $cb Callback |
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| 19 | * @param integer $pri Priority |
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| 20 | * @return void |
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| 21 | */ |
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| 22 | public function insert($cb, $pri = 0) |
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| 26 | |||
| 27 | /** |
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| 28 | * Enqueue callback |
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| 29 | * @param callable $cb Callback |
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| 30 | * @param integer $pri Priority |
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| 31 | * @return void |
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| 32 | */ |
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| 33 | public function enqueue($cb, $pri = 0) |
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| 37 | |||
| 38 | /** |
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| 39 | * Dequeue |
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| 40 | * @return callable |
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| 41 | */ |
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| 42 | public function dequeue() |
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| 46 | |||
| 47 | /** |
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| 48 | * Compare two priorities |
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| 49 | * @param integer $pri1 |
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| 50 | * @param integer $pri2 |
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| 51 | * @return integer |
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| 52 | */ |
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| 53 | public function compare($pri1, $pri2) |
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| 60 | |||
| 61 | /** |
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| 62 | * Executes one callback from the top of queue with arbitrary arguments |
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| 63 | * @param mixed ...$args Arguments |
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| 64 | * @return boolean |
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| 65 | */ |
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| 66 | public function executeOne(...$args) |
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| 77 | |||
| 78 | /** |
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| 79 | * Executes all callbacks from the top of queue to bottom with arbitrary arguments |
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| 80 | * @param mixed ...$args Arguments |
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| 81 | * @return integer |
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| 82 | */ |
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| 83 | View Code Duplication | public function executeAll(...$args) |
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| 98 | } |
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| 99 |
This check looks for a call to a parent method whose name is different than the method from which it is called.
Consider the following code:
The
getFirstName()method in theSoncalls the wrong method in the parent class.