Question

我有一段非常简单的PHP轮询脚本的代码

<h2>Result:</h2>
<table>
  <tr>
    <td>Yes:</td>
    <td><img src="poll.gif"
width='<?php echo(100*round($yes/($no+$yes+$maybe),3)); ?>'
height='20'> <?php echo(100*round($yes/($no+$yes+$maybe),3)); ?>% </td>
  </tr>
  <tr>
    <td>No:</td>
    <td><img src="poll.gif"
width='<?php echo(100*round($no/($no+$yes+$maybe),3)); ?>'
height='20'> <?php echo(100*round($no/($no+$yes+$maybe),3)); ?>% </td>
  </tr>
  <tr>
    <td>Maybe:</td>
    <td><img src="poll.gif"
width='<?php echo(100*round($maybe/($no+$yes+$maybe),3)); ?>'
height='20'> <?php echo(100*round($maybe/($no+$yes+$maybe),3)); ?>% </td>
  </tr>
  <tr>
</table>

然而，如果他们都有相同数量的选票，我得到的结果如33.333333333％。如何将其减少到只有一位小数？

提前致谢！

Answer 1

PHP的Math库有一个圆形方法：

http://www.php.net/manual/en/function.round.php

所以在这种情况下，你会在结果上调用round并指定你想要它到一个小数位：

$rounded_value = round($result,1);

第一个参数是要舍入的值，第二个是小数位数 - 如果不需要小数位，可以将其留空或使用0。

Answer 2

使用round后乘以100，而不是之前。

<?php echo round(($no/($no+$yes+$maybe) * 100 ),1) ; ?>

你的代码也可以简化一点，就像这样

<?php
$votecount = $no+$yes+$maybe;
$yespercentage = round($yes / $votecount * 100,1);
$nopercentage =  round($no / $votecount * 100,1);
$maybepercentage =  round($maybe / $votecount * 100,1);
?>

<table>
  <tr>
    <td>Yes:</td>
    <td><img src="poll.gif"
width='<?php echo $yespercentage; ?>'
height='20'> <?php echo $yespercentage; ?>% </td>
  </tr>
  <tr>
    <td>No:</td>
    <td><img src="poll.gif"
width='<?php echo $nopercentage; ?>'
height='20'> <?php echo $nopercentage; ?>% </td>
  </tr>
  <tr>
    <td>Maybe:</td>
    <td><img src="poll.gif"
width='<?php echo $maybepercentage; ?>'
height='20'> <?php echo $maybepercentage; ?>% </td>
  </tr>
  <tr>
</table>

Answer 3

您尝试使用number_format()吗？像$maybepercentage = number_format(round($maybe / $votecount * 100,1),1);例如：

$maybepercentage =  number_format(round(90 / 120* 100,1),1);
echo $maybepercentage;

结果将变为75.0

更改php poll结果的小数位数

3 个答案: