1 | <?php |
||
7 | class Finder |
||
8 | { |
||
9 | private $id; |
||
10 | |||
11 | /** |
||
12 | * Finder constructor. |
||
13 | * @param $id |
||
14 | */ |
||
15 | 9 | public function __construct($id) |
|
19 | |||
20 | /** |
||
21 | * |
||
22 | * Find node in tree by id |
||
23 | * |
||
24 | * @param AbstractNode $node |
||
25 | * @return bool|AbstractNode |
||
26 | */ |
||
27 | 9 | public function find(AbstractNode $node) |
|
54 | } |
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: