1 | <?php |
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9 | trait Key |
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10 | { |
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11 | /** |
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12 | * @param string|int $key |
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13 | * @return bool|mixed |
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14 | */ |
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15 | 3 | public function getKey($key) |
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19 | |||
20 | /** |
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21 | * @return array |
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22 | */ |
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23 | 5 | public function getKeys() |
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27 | |||
28 | /** |
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29 | * @return mixed |
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30 | */ |
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31 | 1 | public function getFirstKey() |
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36 | |||
37 | /** |
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38 | * @return mixed |
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39 | */ |
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40 | 4 | public function getLastKey() |
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45 | |||
46 | /** |
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47 | * @param $key |
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48 | * @return bool |
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49 | */ |
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50 | 3 | public function keyExists($key) |
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54 | |||
55 | } |
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56 |
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.