1 | <?php namespace BuildR\Collection\Collection; |
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20 | trait FilterableCollectionTrait { |
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21 | |||
22 | /** |
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23 | * Returns a new list that only contains the element which the filter is returned. |
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24 | * The filter is accept any callable type. |
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25 | * |
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26 | * The callable takes two argument, the first is the key and the second is the |
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27 | * value of the element. |
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28 | * |
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29 | * @param callable $filter |
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30 | * |
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31 | * @return \BuildR\Collection\ArrayList\ListInterface |
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32 | */ |
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33 | public function filter(callable $filter) { |
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38 | |||
39 | } |
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40 |
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: