| 1 | <?php | ||
| 7 | trait VisibleCondition | ||
| 8 | { | ||
| 9 | /** | ||
| 10 | * @var Closure|null | ||
| 11 | */ | ||
| 12 | protected $visibleCondition; | ||
| 13 | |||
| 14 | /** | ||
| 15 | * @return bool | ||
| 16 | */ | ||
| 17 | public function isVisible() | ||
| 25 | |||
| 26 | /** | ||
| 27 | * @param Closure $condition | ||
| 28 | * | ||
| 29 | * @return $this | ||
| 30 | */ | ||
| 31 | public function setVisibilityCondition(Closure $condition) | ||
| 37 | } | ||
| 38 | 
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.