| 1 | <?php | ||
| 13 | trait HasPrimaryKeyTrait | ||
| 14 | { | ||
| 15 | /** | ||
| 16 | * @var null|string | ||
| 17 | */ | ||
| 18 | protected $primaryKey = null; | ||
| 19 | |||
| 20 | /** | ||
| 21 | * @param $params | ||
| 22 | */ | ||
| 23 | 3 | public function checkParamPrimaryKey($params) | |
| 30 | |||
| 31 | /** | ||
| 32 | * @return string | ||
| 33 | */ | ||
| 34 | 5 | public function getPrimaryKey() | |
| 42 | |||
| 43 | /** | ||
| 44 | * @param $name | ||
| 45 | */ | ||
| 46 | 5 | public function setPrimaryKey($name) | |
| 50 | |||
| 51 | 5 | protected function initPrimaryKey() | |
| 55 | |||
| 56 | /** | ||
| 57 | * @return string | ||
| 58 | */ | ||
| 59 | 5 | protected function generatePrimaryKey() | |
| 63 | } | ||
| 64 | 
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.