$num = 10.4567; ### 第一种：利用round()对浮点数进行四舍五入 ``` echo round($num,2); //10.46 ``` ### 第二种：利用sprintf格式化字符串 ``` $format_num = sprintf("%.2f",$num); echo $format_num; //10.46 ``` ### 第三种：利用千位分组来格式化数字的函数number_format() ``` echo number_format($num, 2); //10.46 ``` #### 或者如下 ``` echo number_format($num, 2, '.', ''); //10/46 ```