比如$a=1.2;
echo $a; //这里我要让它显示为1.5
$a=1.6;
echo $a; //这里我要让它显示为2
也就是说，当$a的小数点后面的值小于5时（不包括0），就按5来显示，小数点后面的值大于5时就按正常的四舍五入
$n = 1.2;//$n = 1.6;$t = explode('.', "$n");$n = $t[1]{0} < 5 ? $t[0] + .5 : round($n);echo $n;
function test($val){ $x=explode('.',sprintf("%.1f", $val)); $a=$x[0]; $d=$x[1]; if($d>0 && $d<5){ $r=$a+0.5; }else{ $r=round($val); } return $r;}echo test(1);//1echo test(1.11);//1.5echo test(1.5);//2echo test(1.6);//2 function fn($num) {
return ceil($num * 2) / 2;
}
$n = 1.2;//$n = 1.6;$t = explode('.', "$n");$n = $t[1]{0} < 5 ? $t[0] + .5 : round($n);echo $n;
function test($val){ $x=explode('.',sprintf("%.1f", $val)); $a=$x[0]; $d=$x[1]; if($d>0 && $d<5){ $r=$a+0.5; }else{ $r=round($val); } return $r;}echo test(1);//1echo test(1.11);//1.5echo test(1.5);//2echo test(1.6);//2需求要说清楚
for($i=1; $i<2; $i+=0.1) printf("%.1f : %s\n", $i, ceil($i * 2) / 2);1.0 : 11.1 : 1.51.2 : 1.51.3 : 1.51.4 : 1.51.5 : 21.6 : 21.7 : 21.8 : 21.9 : 2
function fn($num) {
return ceil($num * 2) / 2;
}
$arr = array(1.0,1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9,2.0,2.1);foreach($arr as $v){ echo $v.' -> '.fn($v).'<br>';}function fn($num){ return ($ret=round($num, 0))>=$num? $ret : $ret+0.5;}
需求要说清楚
for($i=1; $i<2; $i+=0.1) printf("%.1f : %s\n", $i, ceil($i * 2) / 2);1.0 : 11.1 : 1.51.2 : 1.51.3 : 1.51.4 : 1.51.5 : 21.6 : 21.7 : 21.8 : 21.9 : 2
How to upgrade Douyin
Detailed explanation of linux dd command
How to solve the problem that localhost cannot be opened
What should I do if eDonkey Search cannot connect to the server?
Usage of Snoopy class in php
Common website vulnerability detection methods
The difference between git and svn
Tutorial on buying and selling Bitcoin on Huobi.com
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
