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                # PHP deg2rad() 函數 ## 定義和用法 deg2rad() 函數將角度轉換為弧度。 ### 語法 ``` deg2rad(degree_number) ``` | 參數 | 描述 | | --- | --- | | degree_number | 必需。規定要轉換的角度。 | ### 說明 本函數把 _degree_number_ 從角度轉換成弧度。 ## 例子 1 ``` <?php echo deg2rad("30"); echo deg2rad("10"); echo deg2rad("1587"); echo deg2rad("70"); ?> ``` 輸出: ``` 0.523598775598 0.174532925199 27.6983752292 1.2217304764 ``` ## 例子 2 ``` <?php $deg = 180; $rad = deg2rad($deg); echo "角度 $deg 等于弧度 $rad"; ?> ``` 輸出: ``` 角度 180 等于弧度 3.14159265359 ```
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