| 1 | <?php |
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| 8 | class Task extends BaseTask |
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| 9 | { |
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| 10 | /** |
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| 11 | * @var int |
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| 12 | */ |
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| 13 | private $id; |
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| 14 | |||
| 15 | /** |
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| 16 | * @var string |
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| 17 | */ |
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| 18 | private $intervalExpression; |
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| 19 | |||
| 20 | /** |
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| 21 | * @return int |
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| 22 | */ |
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| 23 | public function getId() |
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| 27 | |||
| 28 | /** |
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| 29 | * @return mixed |
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| 30 | */ |
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| 31 | public function getIntervalExpression() |
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| 35 | |||
| 36 | /** |
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| 37 | * {@inheritdoc} |
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| 38 | */ |
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| 39 | public function setInterval(CronExpression $interval, \DateTime $firstExecution = null, \DateTime $lastExecution = null) |
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| 45 | } |
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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: