php保留小数点的方法有几种?
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<?php $num = 121.456789; //第一种:利用round()对浮点数进行四舍五入 echo round($num, 2); //121.46 //第二种:利用sprintf格式化字符串 $format_num = sprintf("%.2f", $num); echo $format_num; //121.46 //第三种:利用千位分组来格式化数字的函数number_format() echo number_format($num, 2); //121.46 //或者如下 echo number_format($num, 2, '.', ''); //121/46 ?>