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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| 30 | class Transformer  | 
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| 31 | { | 
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| 32 | /**  | 
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| 33 | * transform message to XML.  | 
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| 34 | *  | 
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| 35 | * @param array|string|AbstractMessage $message  | 
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| 36 | *  | 
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| 37 | * @return array  | 
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| 38 | */  | 
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| 39 | 7 | View Code Duplication | public function transform($message)  | 
            
| 55 | |||
| 56 | /**  | 
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| 57 | * Transform text message.  | 
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| 58 | *  | 
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| 59 | * @return array  | 
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| 60 | */  | 
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| 61 | 2 | public function transformText(AbstractMessage $message)  | 
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| 70 | |||
| 71 | /**  | 
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| 72 | * Transform image message.  | 
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| 73 | *  | 
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| 74 | * @return array  | 
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| 75 | */  | 
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| 76 | 1 | public function transformImage(AbstractMessage $message)  | 
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| 85 | |||
| 86 | /**  | 
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| 87 | * Transform video message.  | 
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| 88 | *  | 
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| 89 | * @return array  | 
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| 90 | */  | 
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| 91 | 1 | public function transformVideo(AbstractMessage $message)  | 
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| 103 | |||
| 104 | /**  | 
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| 105 | * Transform voice message.  | 
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| 106 | *  | 
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| 107 | * @return array  | 
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| 108 | */  | 
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| 109 | 1 | public function transformVoice(AbstractMessage $message)  | 
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| 118 | |||
| 119 | /**  | 
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| 120 | * Transform articles message.  | 
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| 121 | *  | 
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| 122 | * @return array  | 
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| 123 | */  | 
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| 124 | 1 | View Code Duplication | public function transformNews($news)  | 
            
| 143 | |||
| 144 | /**  | 
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| 145 | * Transform material message.  | 
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| 146 | *  | 
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| 147 | * @return array  | 
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| 148 | */  | 
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| 149 | public function transformMaterial(AbstractMessage $message)  | 
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| 160 | }  | 
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| 161 |