1 | <?php |
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17 | class ViewportSize implements \JsonSerializable |
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18 | { |
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19 | /** |
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20 | * Width. |
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21 | * |
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22 | * @var int |
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23 | */ |
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24 | private $width; |
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25 | |||
26 | /** |
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27 | * Height. |
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28 | * |
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29 | * @var int |
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30 | */ |
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31 | private $height; |
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32 | |||
33 | /** |
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34 | * Internal constructor. |
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35 | * |
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36 | * @param int $width |
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37 | * @param int $height |
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38 | */ |
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39 | public function __construct($width, $height) |
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44 | |||
45 | /** |
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46 | * Format data for JSON serialization. |
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47 | * |
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48 | * @return array |
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49 | */ |
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50 | public function jsonSerialize() |
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57 | } |
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58 |
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: