| 1 | <?php |
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| 4 | trait OrderLineArrayTrait |
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| 5 | { |
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| 6 | /** |
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| 7 | * @var OrderLineInterface[] |
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| 8 | */ |
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| 9 | private $orderLines; |
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| 10 | |||
| 11 | /** |
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| 12 | * @return OrderLineInterface[] |
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| 13 | */ |
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| 14 | public function getOrderLines() : array |
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| 18 | |||
| 19 | /** |
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| 20 | * @param OrderLine[] $orderLines |
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| 21 | * @return OrderLineArrayTrait |
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| 22 | */ |
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| 23 | public function setOrderLines(array $orderLines) |
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| 28 | |||
| 29 | /** |
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| 30 | * @param OrderLineInterface $orderLine |
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| 31 | * @return OrderLineArrayTrait |
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| 32 | */ |
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| 33 | public function addOrderLine(OrderLineInterface $orderLine) : self |
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| 38 | |||
| 39 | /** |
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| 40 | * @param OrderLineInterface $orderLine |
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| 41 | * @return OrderLineArrayTrait |
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| 42 | */ |
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| 43 | public function removeOrderLine(OrderLineInterface $orderLine) : self |
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| 53 | } |
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| 54 |
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.