| 1 | <?php |
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| 18 | class RecyclingLogManager { |
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| 19 | /** @var EntityManager **/ |
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| 20 | protected $entityManager; |
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| 21 | |||
| 22 | /** |
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| 23 | * @param EntityManager $entityManager |
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| 24 | */ |
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| 25 | public function __construct(EntityManager $entityManager) { |
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| 28 | |||
| 29 | /** |
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| 30 | * @param RecyclingLog $recyclingLog |
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| 31 | */ |
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| 32 | public function add(RecyclingLog $recyclingLog) |
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| 37 | |||
| 38 | /** |
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| 39 | * @param int $baseId |
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| 40 | * @return array |
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| 41 | */ |
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| 42 | public function getBaseActiveMissionsLogs($baseId) |
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| 46 | } |
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different sub-classes of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the parent class: