//SELECT id,pid,path FROM calss;取得数据集组合成下面的数组
$array = array('1' => 0, '2' => 1, '3' => 2, '4' => 2, '5' => 3, '6' => 3, '7' => 3, '8' => 0, '9' => 8);
$pathArray = array(1 => 'web', 2 => 'control', 3 => 'language', 4 => 'data', 5 => 'php', 6 => 'jsp', 7 => 'asp', 8 => 'phone', 9 => 'ios');
//取得id列表
$idArry=array();
getTopID(5, $array);
//循环id列表输出最后结果
echo listPath(5, $idArr, $pathArray), "\n";
unset($idArr);
getTopID(6, $array);
echo listpath(6, $idArr, $pathArray), "\n";
unset($idArr);
getTopID(8, $array);
echo listpath(8, $idArr, $pathArray), "\n";
unset($idArr);
getTopID(9, $array);
echo listpath(9, $idArr, $pathArray), "\n";
unset($idArr);

//函数
/**
 * 取得上级Id数组
 * @param $id
 * @param $array
 * @return array
 */
function getTopID($id, $array)
{
    global $idArr;
    if (isset($array[$id])) {
        $idArr[] = $array[$id];
        getTopID($array[$id], $array);
    }
}

/**
 * 根据上级ID数组排序结果
 * @param $id
 * @param $list
 * @param $array
 * @return string
 */
function listPath($id, $list, $array)
{
    $path = '';
    array_push($list, $id);
    sort($list);
    foreach ($list as $value) {
        if (isset($array[$value])) {
            $path .= $array[$value] . '/';
        }
    }
    return $path;
}