1 | <?php declare(strict_types = 1); |
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10 | trait StringContainer |
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11 | { |
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12 | /** |
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13 | * Stringify if value is a scalar, throw an expection otherwise. |
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14 | */ |
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15 | protected static function checkMember($value) |
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25 | |||
26 | /** |
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27 | * Check whether an equal member alredy exists in this Listing. |
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28 | */ |
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29 | public function contains($member): bool |
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33 | } |
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34 |
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: