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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| 14 | class SecureClientSocket extends SecureSocket  | 
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| 15 | { | 
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| 16 | |||
| 17 | /**  | 
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| 18 | * Whether the socket is connected  | 
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| 19 | *  | 
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| 20 | * @var boolean  | 
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| 21 | */  | 
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| 22 | private $conntected;  | 
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| 23 | |||
| 24 | /**  | 
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| 25 | * Create a new client socket  | 
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| 26 | *  | 
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| 27 | * @param Endpoint $endpoint  | 
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| 28 | * The endpoint to use  | 
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| 29 | * @param resource $clientHandle  | 
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| 30 | * optional existing client handle  | 
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| 31 | */  | 
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| 32 | 12 | View Code Duplication | public function __construct(Endpoint $endpoint, $clientHandle = null)  | 
            
| 42 | |||
| 43 | /**  | 
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| 44 | * Connect to remote endpoint  | 
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| 45 | *  | 
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| 46 | * @throws SocketException  | 
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| 47 | */  | 
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| 48 | 11 | public function connect()  | 
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| 52 | |||
| 53 | /**  | 
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| 54 | * Disconnects the socket  | 
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| 55 | *  | 
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| 56 | * @throws SocketException  | 
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| 57 | */  | 
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| 58 | 5 | public function disconnect()  | 
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| 66 | |||
| 67 | /**  | 
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| 68 | * Whether the client is connected  | 
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| 69 | *  | 
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| 70 | * @return bool  | 
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| 71 | */  | 
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| 72 | 11 | public function isConnected(): bool  | 
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| 76 | |||
| 77 | /**  | 
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| 78 | *  | 
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| 79 | * @see \Generics\Socket\ClientSocket::disconnect()  | 
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| 80 | */  | 
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| 81 | 6 | public function close()  | 
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| 86 | |||
| 87 | /**  | 
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| 88 | *  | 
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| 89 |      * {@inheritdoc} | 
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| 90 | * @see \Generics\Socket\Socket::isWriteable()  | 
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| 91 | */  | 
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| 92 | 11 | public function isWriteable(): bool  | 
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| 100 | }  | 
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| 101 |