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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| 29 | trait ManageCommentReplies  | 
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| 30 | { | 
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| 31 | /**  | 
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| 32 | * Reply to a comment.  | 
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| 33 | *  | 
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| 34 | * @param int $commentId  | 
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| 35 | * @param string $content  | 
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| 36 | *  | 
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| 37 | * @return \EasyWeChat\Support\Collection  | 
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| 38 | */  | 
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| 39 | 1 | View Code Duplication | public function reply($commentId, $content)  | 
            
| 48 | |||
| 49 | /**  | 
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| 50 | * Delete a reply.  | 
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| 51 | *  | 
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| 52 | * @param int $commentId  | 
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| 53 | *  | 
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| 54 | * @return \EasyWeChat\Support\Collection  | 
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| 55 | */  | 
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| 56 | 1 | View Code Duplication | public function deleteReply($commentId)  | 
            
| 64 | }  | 
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| 65 | 
This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idableprovides a methodequalsIdthat in turn relies on the methodgetId(). If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()as an abstract method to the trait will make sure it is available.