PHP中数字千分位逗号分隔函数number_format()

摘自PHP官方文档

(PHP 4, PHP 5)

number_format — 以千位分隔符方式格式化一个数字

说明

string number_format ( float$number [, int$decimals = 0 ] ) string number_format ( float$number , int$decimals = 0 , string $dec_point = "." , string $thousands_sep = "," )

本函数可以接受1个、2个或者4个参数（注意：不能是3个）:

如果只提供第一个参数， number 的小数部分会被去掉 并且每个千位分隔符都是英文小写逗号","

如果提供两个参数， number 将保留小数点后的位数到你设定的值，其余同楼上

如果提供了四个参数， number 将保留decimals 个长度的小数部分, 小数点被替换为 dec_point ，千位分隔符替换为 thousands_sep

参数

number

你要格式化的数字

decimals

要保留的小数位数

dec_point

指定小数点显示的字符

thousands_sep

指定千位分隔符显示的字符      

Example #1 number_format() Example

For instance, French notation usually use two decimals, comma (",") as decimal separator, and space (" ") as thousand separator. This is achieved with this line :

<?php

$number = 1234.56;

// english notation (default)
$english_format_number =number_format ( $number );
// 1,235

// French notation
$nombre_format_francais =number_format ( $number , 2 , "," , " " );
// 1 234,56

$number =1234.5678 ;

// english notation without thousands separator
$english_format_number =number_format ( $number , 2 , "." , "" );
// 1234.57

?>