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

//第四种：不四舍五入保留两位小数
echo sprintf("%.2f",substr(sprintf("%.3f", $num), 0, -2)); //10.45