PHP infinite level classification, find the ID of the top-level classification through the subclass ID

From , 3 Years ago, written in PHP, viewed 239 times.

// 自己基于ThinkPHP写的，亲测可用
/**
 * [getNavPid 假设顶级分类的父ID是0，根据传入的子分类ID，查找子分类的顶级父类ID]
 * @param  [int]  $id   [传入的子类ID]
 * @return [int]        [返回顶级分类ID]
 */
function getNavPid($id){
        $nav = M('nav')->find($id);
        if($nav['f_id'] != 0){ return getNavPid($nav['f_id']); }
        return $nav['id'];
}
 
// 以下两段是网友分享的，没有测试过
function foo($id) {
        $rs = mysql_query("select * from tbl_name where id='$id'");
        $r = mysql_fetch_assoc($rs);
        if($r['pid'] != 0) return foo($r['pid']);
        return $r['id'];
}
 
function tree($arr,$id){
        static $list=array();
        foreach($arr as $u){
                if($u[‘pid’]== $id){
                        $list[]=$u;
                        If($u[‘pid’]>0){
                                tree($arr.$u[‘pid’]);
                        }
                }
　　}
　　return $list;
}
 
 
 

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PHP infinite level classification, find the ID of the top-level classification through the subclass ID

Reply to "PHP infinite level classification, find the ID of the top-level classification through the subclass ID"