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 Question extends ActiveRecordModelExtender  | 
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| 9 | { | 
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| 10 | |||
| 11 | /**  | 
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| 12 | * @var string $tableName name of the database table.  | 
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| 13 | */  | 
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| 14 | protected $tableName = "ramverk1_questions";  | 
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| 15 | |||
| 16 | /**  | 
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| 17 | * Columns in the table.  | 
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| 18 | *  | 
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| 19 | * @var integer $id primary key auto incremented.  | 
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| 20 | */  | 
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| 21 | public $id;  | 
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| 22 | public $user;  | 
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| 23 | |||
| 24 | public $title;  | 
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| 25 | public $tags;  | 
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| 26 | |||
| 27 | public $created;  | 
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| 28 | public $status; # default is active  | 
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| 29 | |||
| 30 | /**  | 
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| 31 | * Set ups the question  | 
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| 32 | * @param object $question  | 
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| 33 | * @param array $param  | 
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| 34 | *  | 
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| 35 | * @return object  | 
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| 36 | */  | 
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| 37 | 8 | public function setupQuestion($question)  | 
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| 38 |     { | 
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| 39 | 8 | $user = new User($this->db);  | 
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| 40 | 8 | $post = new Post($this->db);  | 
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| 41 | |||
| 42 | 8 | $question->img = $user->getGravatar($question->user);  | 
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| 43 | 8 | $question->title = $this->getMD($question->title);  | 
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| 44 | 8 |         $question->tags = explode(',', $question->tags); | 
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| 45 | |||
| 46 | 8 |         $question->question = $post->getPost("questionId = ? AND type = ?", [$question->id, "question"]); | 
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| 47 | 8 |         $question->answers = $post->getAllPosts("questionId = ? AND type = ?", [$question->id, "answer"]); | 
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| 48 | 8 | $question->answerCount = count($question->answers);  | 
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| 49 | |||
| 50 | |||
| 51 | 8 | return $question;  | 
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| 52 | }  | 
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| 53 | /**  | 
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| 54 | * Returns post with markdown and gravatar  | 
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| 55 | * @param string $sql  | 
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| 56 | * @param array $param  | 
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| 57 | *  | 
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| 58 | * @return array  | 
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| 59 | */  | 
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| 60 | 8 | View Code Duplication | public function getQuestions($sql = null, $params = null)  | 
            
| 61 |     { | 
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| 62 | 8 |         if ($sql == null) { | 
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| 63 | 2 | $questions = $this->findAll();  | 
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| 64 | 2 | }  | 
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| 65 | 8 |         if ($sql != null) { | 
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| 66 | 8 | $questions = $this->findAllWhere($sql, $params);  | 
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| 67 | 8 | }  | 
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| 68 | // array_reverse so latest order question gets returned  | 
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| 69 | 8 | return array_map(array($this, 'setupQuestion'), $questions);  | 
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| 70 | }  | 
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| 71 | |||
| 72 | /**  | 
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| 73 | * Returns one question with it's own question text and other answers  | 
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| 74 | * @param int $id  | 
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| 75 | *  | 
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| 76 | * @return object  | 
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| 77 | */  | 
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| 78 | 7 | public function getQuestion($id)  | 
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| 79 |     { | 
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| 80 | 7 |         $question = $this->find("id", $id); | 
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| 81 | 7 | return $this->setupQuestion($question);  | 
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| 82 | }  | 
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| 83 | |||
| 84 | /**  | 
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| 85 | * Returns array of tags, keys are name, value is the integer of how many.  | 
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| 86 | *  | 
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| 87 | * @return array  | 
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| 88 | */  | 
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| 89 | 1 | public function getPopularTags()  | 
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| 102 | }  | 
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| 103 | 
This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function.
Consider the following example. The parameter
$italyis not defined by the methodfinale(...).The most likely cause is that the parameter was removed, but the annotation was not.