php顺序查找和二分查找示例_php实例

class search
{
// 查找的源数组
private $array = array(1,2,3,5,7,6,4,8);

/**
* 顺序查找法
* @param $val 要查找的值
*/
public function query_search($val)
{
foreach ($this->array as $k => $v)
{
if($v == $val)
{
echo '顺序查找成功!';
exit(0);
}
}

echo '顺序查找失败!';
}

/**
* 二分查找法
* @param $val 要查找的值
*/
public function bin_search($val)
{
sort($this->array);

$min = 0;
$max = count($this->array);

for ($i = $min; $i < $max; $i++)
{
$mid = ceil(($min + $max) / 2);

if($val == $this->array[$mid])
{
echo '二分查找成功!';
exit(0);
}
else if($val < $this->array[$mid])
{
$max = $mid;
}
else if($val > $this->array[$mid])
{
$min = $mid;
}
}

echo '二分查找失败!';
}
}