1 | <?php |
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12 | trait HasPreviousUrlTrait |
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13 | { |
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14 | |||
15 | /** |
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16 | * Get the URL for the previous request. |
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17 | * |
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18 | * @param mixed $fallback |
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19 | * @return string |
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20 | */ |
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21 | public function previous($fallback = false) |
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33 | |||
34 | /** |
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35 | * Get the previous URL from the session if possible. |
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36 | * |
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37 | * @return string|null |
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38 | */ |
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39 | protected function getPreviousUrlFromSession() |
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45 | |||
46 | } |
This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idable
provides a methodequalsId
that in turn relies on the methodgetId()
. If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()
as an abstract method to the trait will make sure it is available.