| 1 | <?php  | 
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| 13 | trait Executable  | 
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| 14 | { | 
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| 15 | /**  | 
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| 16 | * @var PDO  | 
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| 17 | */  | 
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| 18 | protected $pdo;  | 
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| 19 | |||
| 20 | /**  | 
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| 21 | * @var int  | 
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| 22 | */  | 
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| 23 | protected $rowCount;  | 
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| 24 | |||
| 25 | /**  | 
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| 26 | * Sets the PDO instance used by this query.  | 
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| 27 | *  | 
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| 28 | * @param PDO $pdo  | 
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| 29 | *  | 
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| 30 | * @return self  | 
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| 31 | */  | 
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| 32 | public function setPDO($pdo)  | 
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| 38 | |||
| 39 | /**  | 
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| 40 | * Gets the PDO instance used by this query.  | 
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| 41 | *  | 
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| 42 | * @return PDO  | 
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| 43 | */  | 
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| 44 | public function getPDO()  | 
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| 48 | |||
| 49 | /**  | 
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| 50 | * Executes a query.  | 
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| 51 | *  | 
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| 52 | * @return PDOStatement|bool result  | 
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| 53 | */  | 
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| 54 | public function execute()  | 
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| 66 | |||
| 67 | /**  | 
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| 68 | * Returns the number of rows affected by the last executed statement.  | 
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| 69 | *  | 
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| 70 | * @return int  | 
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| 71 | */  | 
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| 72 | public function rowCount()  | 
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| 76 | }  | 
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| 77 | 
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.