php 数组二分法查找函数代码_PHP

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Release: 2016-06-01 12:20:13
Original
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复制代码 代码如下:
//search函数 其中$array为数组,$k为要找的值,$low为查找范围的最小键值,$high为查找范围的最大键值
function search($array, $k, $low=0, $high=0)
{
if(count($array)!=0 and $high == 0) //判断是否为第一次调用
{
$high = count($array);
}
if($low {
$mid = intval(($low+$high)/2); //取$low和$high的中间值
if ($array[$mid] == $k) //如果找到则返回
{
return $mid;
}
elseif ($k {
return search($array, $k, $low, $mid-1);
}
else
{
return search($array, $k, $mid+1, $high);
}
}
return -1;
}
$array = array(4,5,7,8,9,10); //测试search函数
echo search($array, 8); //调用search函数并输出查找结果
?>
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