无限极分类两种

第一种

public function getTree($data,$id=0,$lev=1,$iscache=true)
{
   static $list = array();
   //根据参数决定是否需要重置
   if(!$iscache){
      $list=array();
   }
   foreach ($data as $key => $value) {
      if($value['parent_id']==$id){
         $value['lev']=$lev;
         $list[]=$value;
         //使用递归的方式获取分类下的子分类
         $this->getTree($data,$value['id'],$lev+1);
      }
   }
   return $list;
}

第二种

/**
 * 分类路径配置
 * @param  string $m ,$pid 数据表,父id
 * @return null
 * @author App <itholiday@126.com>
 */
function setPath($m, $pid)
{
    $cate = $m;
    $map['id'] = $pid;
    $list = $cate->field('id,path')->where($map)->limit(1)->find();
    $path = $list['path'] . '-' . $list['id'];
    $lv = count(explode('-', $path));
    return array('path' => $path, 'lv' => $lv);
}

/**
 * SonCate配置
 * @param  string $m ,$pid 数据表,父id
 * @return null
 * @author App <itholiday@126.com>
 */
function setSoncate($m, $pid)
{
    $cate = $m;
    $map['pid'] = $pid;
    $father = $cate->where('id=' . $pid)->limit(1)->find();
    $son = $cate->field('id')->where($map)->select();
    if ($son && $father) {
        //存在子栏目
        $arr = '';
        foreach ($son as $k => $v) {
            $arr = $arr . $v['id'] . ',';
        }
        $father['soncate'] = $arr;
        $rf = $m->save($father);
        if ($rf === FALSE) {
            return FALSE;
        } else {
            return TRUE;
        }
    } elseif (!$son && $father) {
        //子栏目为空
        $father['soncate'] = '';
        $rf = $m->save($father);
        if ($rf === FALSE) {
            return FALSE;
        } else {
            return TRUE;
        }
    } else {
        //未知错误
        return FALSE;
    }
}

/**
 * 获取分类
 * @param  string $m
 * @return array
 */
function getCate($m, $where = '')
{
    $cates = array();
    $list = $m->where($where)->select();
    foreach ($list as $k => $v) {
        $cates[$v['id']] = $v['name'];
    }
    return $cates;
}

/**
 * AppTree快速无限分类树
 * @param  string $m ,$pid 数据表,父id
 * @return null
 * @author App <itholiday@126.com>
 */
function appTree($pid, $field, $map, $order = 'sorts desc', $keyid = 'id', $keypid = 'pid', $tree = true, $keychild = '_child')
{
    $sql = "select $field from ims_yq_haircircle_task_cate where $map order by $order";
    $list = pdo_fetchall($sql);
    if ($tree) {
        $list = list_to_tree($list, $keyid, $keypid, $keychild, $root = $pid);//无限
    } else {
        $list = array();
        $list = list_to_treelist($list, $keyid, $keypid, $root = $pid);//二维
    }
    return $list;
}


/**
 * 把返回的数据集转换成Tree
 * @param array $list 要转换的数据集
 * @param string $pid parent标记字段
 * @param string $level level标记字段
 * @return array
 */
function list_to_tree($list, $pk = 'id', $pid = 'pid', $child = '_child', $root = 0)
{
    // 创建Tree
    $tree = array();
    if (is_array($list)) {
        // 创建基于主键的数组引用
        $refer = array();
        foreach ($list as $key => $data) {
            $refer[$data[$pk]] = &$list[$key];
        }
        foreach ($list as $key => $data) {
            // 判断是否存在parent
            $parentId = $data[$pid];
            if ($root == $parentId) {
                $tree[] = &$list[$key];
            } else {
                if (isset($refer[$parentId])) {
                    $parent = &$refer[$parentId];
                    $parent[$child][] = &$list[$key];
                }
            }
        }
    }
    return $tree;
}