php不使用递归实现无限极分类

$mysql = new MySQLi(‘localhost‘,‘root‘,‘‘,‘test‘);
$mysql->query("set names gb2312");
/**
 * 获取无限分类列表(树形查询) 主要用于后台的栏目列表
 */
$sql = ‘select ac_name,concat(path,"-",ac_id) as bpath from article_class order by bpath,ac_id‘;
$result = $mysql->query($sql);
while($row = $result->fetch_assoc()){
    echo $row[‘ac_name‘].‘<br />‘;
}
echo ‘<hr />‘;
/**
 * 指定分类获取全部的父类(逆向查询) 主要用于编辑文章时获取该文章的相关分类
 */
$ac_id = 10;
$sqlonly = ‘select * from article_class where ac_id=‘.$ac_id;
$resultonly = $mysql->query($sqlonly);
$pclass = array();
$curclass = ‘‘;
while ($rowonly = $resultonly->fetch_assoc()){
    $curclass = $rowonly[‘ac_name‘];
    $arrpaht = explode(‘-‘,$rowonly[‘path‘]);
    $arrpaht = implode(‘,‘,$arrpaht);
    
    $sqlall = ‘select * from article_class where ac_id in (‘.$arrpaht.‘) order by ac_id‘;

    $resultall = $mysql->query($sqlall);
    while($rowall = $resultall->fetch_assoc()){
        $pclass[] = $rowall[‘ac_name‘];    
    }
}
array_push($pclass,$curclass);
echo ‘<pre>‘;
    print_r($pclass);
echo ‘</pre>‘;
echo ‘<hr />‘;
/**
 * 指定分类获取下一级分类 主要用于展开分类时显示下一级分类使用
 */
function getNextClass($ac_id){
    global $mysql;
    $sql = ‘select * from article_class where pid=‘.$ac_id;
    $resultnext = $mysql->query($sql);
    while($rownext = $resultnext->fetch_assoc()){
        echo $rownext[‘ac_name‘].‘<br />‘;    
    }
}
getNextClass(1);