PHP保留两位小数的几种方法？

$num = 10.4567;

//第一种：利用round()对浮点数进行四舍五入

echo round($num,2); //10.46

//第二种：利用sprintf格式化字符串

$format_num = sprintf("%.2f",$num);

echo $format_num; //10.46

//第三种：利用千位分组来格式化数字的函数number_format()

echo number_format($num, 2); //10.46

//或者如下

echo number_format($num, 2, '.', ''); //10/46