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PHP四舍五入精确小数位及取整_PHP

Jun 01, 2016 am 11:57 AM
php rounding

进一法取整、四舍五入取整、忽略小数等的取整数方法大全

PHP取整数函数常用的四种方法,下面收集了四个函数;经常用到取整的函数,今天小小的总结一下!其实很简单,就是几个函数而已~~主要是:ceil,floor,round,intval
PHP取整数函数常用的四种方法,下面收集了四个函数;
经常用到取整的函数,今天小小的总结一下!其实很简单,就是几个函数而已~~主要是:ceil,floor,round,intval

一、ceil — 进一法取整

说明
float ceil ( float value )
返回不小于 value 的下一个整数,value 如果有小数部分则进一位。ceil() 返回的类型仍然是 float,因为 float 值的范围通常比 integer 要大。
例子 1. ceil() 例子

复制代码 代码如下:
echo ceil(4.3); // 5
echo ceil(9.999); // 10
?>

二、floor — 舍去法取整

说明
float floor ( float value )
返回不大于 value 的下一个整数,将 value 的小数部分舍去取整。floor() 返回的类型仍然是 float,因为 float 值的范围通常比 integer 要大。
例子 1. floor() 例子

复制代码 代码如下:
echo floor(4.3); // 4
echo floor(9.999); // 9
?>

三、round — 对浮点数进行四舍五入

说明
float round ( float val [, int precision] )
返回将 val 根据指定精度 precision(十进制小数点后数字的数目)进行四舍五入的结果。precision 也可以是负数或零(默认值)。
例子 1. round() 例子

复制代码 代码如下:
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
?>

四、intval—对变数转成整数型态

例子intval()

复制代码 代码如下:
echo intval(4.3); //4
echo intval(4.6); // 4
?>

PHP四舍五入精确小数位及取整

(1)php保留三位小数并且四舍五入

复制代码 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

复制代码 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)

复制代码 代码如下:
echo ceil(4.3);    // 5
echo ceil(9.999);  // 10

  (4)php舍去法取整数

复制代码 代码如下: 
echo floor(4.3);   // 4
echo floor(9.999); // 9

  (5),round函数

  例 1. round() 例子

复制代码 代码如下: 
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
?>

PHP四舍五入保留两位小数点最精确的方法

复制代码 代码如下:
$number = 123213.066666;
echo sprintf("%.2f", $number);
?>

输出结果:
123213.07

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