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                # PHP floor() 函數 ## 定義和用法 floor() 函數向下舍入為最接近的整數。 ### 語法 ``` floor(x) ``` | 參數 | 描述 | | --- | --- | | x | 必需。一個數。 | ### 說明 返回不大于 _x_ 的下一個整數,將 _x_ 的小數部分舍去取整。floor() 返回的類型仍然是 float,因為 float 值的范圍通常比 integer 要大。 ## 例子 在本例中,我們將對不同的數應用 floor() 函數: ``` <?php echo(floor(0.60)); echo(floor(0.40)); echo(floor(5)); echo(floor(5.1)); echo(floor(-5.1)); echo(floor(-5.9)) ?> ``` 輸出: ``` 0 0 5 5 -6 -6 ```
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