用选择排序法第一步从输入的数组中找到最高分和最低分，然后去掉一个最高分和一个最低分，得出选手的平均分。
1. 实现代码
<?php
function fairScore(&$arr)
{ //选择排序法的第一步，这里只需要找到这个数组中的最大值和最小值即可，没必要对整个数组排序
$minVal = $arr[0];
$minIndex = 0;
$maxVal = $arr[0];
$maxIndex = 0;
$sum = 0;
for ($i=1;$i<count($arr);$i++)
{
if ($arr[$i]<$minVal)
{
$minVal = $arr[$i];;
$minIndex = $i;
}
if ($arr[$i]>$maxVal)
{
$maxVal = $arr[$i];
$maxIndex = $i;
}
}
echo "最高分是:".$maxVal." 最低分是:".$minVal."<br/>";
for ($i=0;$i<count($arr);$i++)
{
$sum +=$arr[$i];
}
$sum -=($minVal+$maxVal);
echo "一共有".count($arr)."个评委,去掉最高分和最低分后的平均分是".$sum/(count($arr)-2);
}
$score = @$_REQUEST['score'];//第一次打开页面时会因为没有输入数据，所以没法提交。这里加@是为了去除浏览器notice警告
$aScore = explode(" ",$score);
?>
<html>
<head>
<title>去掉最高分和最低分后的平均分</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8"/>
</head>
<body>
<form action ="fairScore.php" method="post">
<span>请输入各个评委的打分，中间用空格隔开</span><br/><!--在输入时，每两个数之间只能有一个空格-->
<input type="text" name="score" value="<?php echo $score;?>" /><br/>
<input type="submit" value="提交计算平均成绩"/>
</form>
<?php
fairScore($aScore);
?>
</body>
<html>
2. 运行效果图
以上就是本文的全部内容，希望大家可以喜欢。
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