PHP实现保留两位小数
2019-05-09 19:11:01
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$num = 20.6568;
//第一种：利用round()对浮点数进行四舍五入
echo round($num,2); //20.66
//第二种：利用sprintf格式化字符串 推荐使用第二种 如果$num = 20 输出$num = 20.00
$format_num = sprintf("%.2f",$num);
echo $format_num; //20.66
//第三种：利用千位分组来格式化数字的函数number_format()
echo number_format($num, 2); //20.66
echo number_format($num, 2, '.', ''); //20.66
