| 1 | <?php |
||
| 7 | trait LicenceNumberTrait |
||
| 8 | { |
||
| 9 | /** |
||
| 10 | * @var string |
||
| 11 | */ |
||
| 12 | private $licence; |
||
| 13 | |||
| 14 | private function __construct(string $licence) |
||
| 18 | |||
| 19 | public function getLicence(): string{ |
||
| 22 | |||
| 23 | /** |
||
| 24 | * @return LicenceNumberTrait|static |
||
|
|
|||
| 25 | */ |
||
| 26 | public static function empty(): self{ |
||
| 29 | |||
| 30 | /** |
||
| 31 | * @param string $licence |
||
| 32 | * |
||
| 33 | * @return LicenceNumberTrait|static |
||
| 34 | */ |
||
| 35 | public static function create(string $licence): self{ |
||
| 38 | |||
| 39 | } |
In PHP traits cannot be used for type-hinting as they do not define a well-defined structure. This is because any class that uses a trait can rename that trait’s methods.
If you would like to return an object that has a guaranteed set of methods, you could create a companion interface that lists these methods explicitly.