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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| 8 | class Component_number  | 
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| 9 | extends AbstractComponent  | 
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| 10 | implements ValueComponentInterface,  | 
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| 11 | DisableableComponentInterface,  | 
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| 12 | FilterableComponentInterface,  | 
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| 13 | ValidatableComponentInterface  | 
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| 14 | { | 
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| 15 | public function default_model()  | 
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| 32 | |||
| 33 | public function filter($v)  | 
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| 37 | |||
| 38 | public function validation($v,&$e)  | 
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| 54 | |||
| 55 | public function required_arguments()  | 
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| 59 | |||
| 60 | public function get_template_path()  | 
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| 64 | }  |