php中取小数位的函数有sprintf,ceil,floor,round等等函数来实现四舍五入,下面我们就一起来看看具体的实例吧。
本篇文章将使用php对数字进行四舍五入保留N位小数,以及使用php对数字进行取整的方法做个小总结。
(1)php保留三位小数并且四舍五入,代码如下:
- $num=0.0215489;
- echo sprintf("%.3f", $num); // 0.022
(2)php保留三位小数不四舍五入,代码如下:
- $num=0.0215489;
- echo substr(sprintf("%.4f", $num),0,-1); // 0.021
(3)php进一法取整数(这个在分页程序的页数程序里面会用到),代码如下:
- echo ceil(4.3); // 5
- echo ceil(9.999); // 10
(4)php舍去法取整数,代码如下:
- echo floor(4.3); // 4
- echo floor(9.999); // 9
(5),round函数
例1.round() 例子,代码如下:
- <?php
- echo round(3.4); // 3
- echo round(3.5); // 4
- echo round(3.6); // 4
- echo round(3.6, 0); // 4
- echo round(1.95583, 2); // 1.96
- echo round(1241757, -3); // 1242000
- echo round(5.045, 2); // 5.05
- echo round(5.055, 2); // 5.06
- ?>
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波比源码 » PHP四舍五入精确小数位及取整
波比源码 » PHP四舍五入精确小数位及取整
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