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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| 7 | class Option extends Input  | 
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| 8 | { | 
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| 9 | /**  | 
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| 10 | * Option shortcut.  | 
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| 11 | *  | 
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| 12 | * @var null|string  | 
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| 13 | */  | 
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| 14 | protected $shortcut = null;  | 
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| 15 | |||
| 16 | /**  | 
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| 17 | * Default option value.  | 
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| 18 | *  | 
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| 19 | * @var null|string  | 
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| 20 | */  | 
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| 21 | protected $default = null;  | 
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| 22 | |||
| 23 | /**  | 
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| 24 | * Parse the set input string.  | 
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| 25 | *  | 
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| 26 | * @return $this  | 
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| 27 | */  | 
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| 28 | public function parse()  | 
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| 38 | |||
| 39 | /**  | 
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| 40 | * Parse option value and value default.  | 
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| 41 | *  | 
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| 42 | * @return $this  | 
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| 43 | */  | 
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| 44 | protected function setValue()  | 
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| 60 | |||
| 61 | /**  | 
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| 62 | * If mode is empty, set VALUE_NONE.  | 
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| 63 | *  | 
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| 64 | * @return $this  | 
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| 65 | */  | 
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| 66 | protected function setEmptyMode()  | 
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| 72 | |||
| 73 | /**  | 
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| 74 | * Set option shortcut.  | 
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| 75 | *  | 
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| 76 | * @return $this  | 
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| 77 | */  | 
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| 78 | View Code Duplication | protected function setShortcut()  | 
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| 86 | |||
| 87 | /**  | 
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| 88 | * Get the option attributes.  | 
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| 89 | *  | 
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| 90 | * @return array  | 
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| 91 | */  | 
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| 92 | public function getAttributes()  | 
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| 102 | }  | 
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| 103 |