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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| 21 | View Code Duplication | class TerminateEvent extends Event  | 
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| 22 | { | 
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| 23 | /** @var CommandInterface */  | 
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| 24 | private $command;  | 
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| 25 | |||
| 26 | /** @var ResponseInterface */  | 
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| 27 | private $response;  | 
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| 28 | |||
| 29 | /**  | 
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| 30 | *  | 
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| 31 | * @param CommandInterface $command  | 
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| 32 | * @param ResponseInterface $response  | 
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| 33 | */  | 
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| 34 | public function __construct(CommandInterface $command, ResponseInterface $response)  | 
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| 39 | |||
| 40 | /**  | 
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| 41 | *  | 
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| 42 | * @param CommandInterface  | 
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| 43 | */  | 
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| 44 | public function getCommand()  | 
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| 48 | |||
| 49 | /**  | 
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| 50 | *  | 
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| 51 | * @param ResponseInterface $response  | 
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| 52 | */  | 
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| 53 | public function setResponse(ResponseInterface $response)  | 
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| 57 | |||
| 58 | /**  | 
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| 59 | *  | 
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| 60 | * @return ResponseInterface  | 
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| 61 | */  | 
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| 62 | public function getResponse()  | 
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| 66 | }  | 
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| 67 |