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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| 19 | class ReactFactory |
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| 20 | { |
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| 21 | /** |
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| 22 | * Build a react Event Loop. |
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| 23 | * |
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| 24 | * @return LoopInterface |
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| 25 | */ |
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| 26 | 109 | public static function buildEventLoop() |
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| 30 | |||
| 31 | /** |
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| 32 | * Build a React Dns Resolver. |
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| 33 | * |
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| 34 | * @param LoopInterface $loop |
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| 35 | * @param string $dns |
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| 36 | * |
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| 37 | * @return DnsResolver |
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| 38 | */ |
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| 39 | 109 | public static function buildDnsResolver( |
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| 47 | |||
| 48 | /** |
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| 49 | * @param LoopInterface $loop |
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| 50 | * @param DnsResolver|null $dns |
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| 51 | * |
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| 52 | * @return ConnectorInterface |
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| 53 | */ |
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| 54 | public static function buildConnector( |
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| 62 | |||
| 63 | /** |
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| 64 | * Build a React Http Client. |
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| 65 | * |
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| 66 | * @param LoopInterface $loop |
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| 67 | * @param ConnectorInterface|DnsResolver|null $connector Passing a DnsResolver instance is deprecated. Should pass a |
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| 68 | * ConnectorInterface instance. |
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| 69 | * |
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| 70 | * @return HttpClient |
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| 71 | */ |
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| 72 | 111 | public static function buildHttpClient( |
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| 83 | |||
| 84 | /** |
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| 85 | * Builds a React Http client v0.4 style |
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| 86 | * |
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| 87 | * @param LoopInterface $loop |
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| 88 | * @param DnsResolver|null $dns |
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| 89 | * |
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| 90 | * @return HttpClient |
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| 91 | */ |
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| 92 | 111 | View Code Duplication | private static function buildHttpClient04( |
| 110 | |||
| 111 | /** |
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| 112 | * Builds a React Http client v0.5 style |
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| 113 | * |
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| 114 | * @param LoopInterface $loop |
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| 115 | * @param DnsResolver|ConnectorInterface|null $connector |
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| 116 | * |
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| 117 | * @return HttpClient |
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| 118 | */ |
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| 119 | View Code Duplication | private static function buildHttpClient05( |
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| 137 | } |
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| 138 |
Let’s assume you have a class which uses late-static binding:
}
The code above will run fine in your PHP runtime. However, if you now create a sub-class and call the
getSomeVariable()on that sub-class, you will receive a runtime error:In the case above, it makes sense to update
SomeClassto useselfinstead: