| 1 | <?php |
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| 2 | class Xhgui_WatchFunctions |
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| 3 | { |
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| 4 | protected $storage; |
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| 5 | |||
| 6 | public function __construct(\Xhgui_StorageInterface $storage) |
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| 10 | |||
| 11 | /** |
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| 12 | * Save a value to the collection. |
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| 13 | * |
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| 14 | * Will do an insert or update depending |
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| 15 | * on the id field being present. |
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| 16 | * |
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| 17 | * @param array $data The data to save. |
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| 18 | * @return boolean |
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| 19 | */ |
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| 20 | public function save($data) |
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| 38 | |||
| 39 | /** |
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| 40 | * Get all the known watch functions. |
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| 41 | * |
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| 42 | * @return array Array of watch functions. |
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| 43 | */ |
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| 44 | public function getAll() |
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| 54 | |||
| 55 | /** |
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| 56 | * Truncate the watch collection. |
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| 57 | * |
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| 58 | * @return void |
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| 59 | */ |
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| 60 | public function truncate() |
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| 64 | |||
| 65 | } |
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| 66 |
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 implementation 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 interface: