PHP number_format() 函数

格式数字：

<?php
echo number_format("1000000")."<br>";
echo number_format("1000000",2)."<br>";
echo number_format("1000000",2,",",".");
?>

定义和用法

number_format() 函数格式化一个以千为单位的数字。

笔记：此函数支持一个、两个或四个参数（不是三个）。

number_format( number,decimals,decimalpoint,separator)

Parameter	Description
number	Required. The number to be formatted. If no other parameters are set, the number will be formatted without decimals and with comma (,) as the thousands separator.
decimals	Optional. Specifies how many decimals. If this parameter is set, the number will be formatted with a dot (.) as decimal point
decimalpoint	Optional. Specifies what string to use for decimal point
separator	Optional. Specifies what string to use for thousands separator. Only the first character of separator is used. For example, "xxx" will give the same output as "x" Note: If this parameter is given, all other parameters are required as well

返回值：	返回格式化的数字
PHP 版本：	4+
变更日志：	从 PHP 5.4 开始，该函数支持参数中包含多个字节小数点和分隔器。旧版本中仅使用每个分隔符的第一个字节。