The trait Idable provides a method equalsId that in turn relies on the
method getId(). 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.
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}
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/**
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* Get or set preference value.
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*
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* @param mixed $key
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* @param mixed $value
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* @param string $type
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*
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* @return mixed Value.
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*/
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public function pref($key, $value = null, $type = 'string')
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.