number_format
(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
返回值
   格式化以后的 number.
  
更新日志
       版本
       说明
       5.4.0
        This function now supports multiple bytes in
        dec_point and
        thousands_sep. Only the first byte of each
        separator was used in older versions.
  
范例
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
?>
参见
money_format() - Formats a number as a currency string sprintf() - Return a formatted string printf() - 输出格式化字符串 sscanf() - 根据指定格式解析输入的字符