src/thinkextend/Auth.php
public function getGroups($uid)
    {
        static $groups = array();
        if (isset($groups[$uid]))
            return $groups[$uid];

        $user_groups = \think\Db::name($this->_config['AUTH_GROUP_ACCESS'] . ' a')
            ->where("a.uid='$uid' and g.status='1'")
            ->join($this->_config['AUTH_GROUP'] . ' g' , "a.group_id=g.id")
            ->field('rules')->select();

        $groups[$uid] = $user_groups ?: array();
        return $groups[$uid];
    }
public function getGroups($uid)
    {
        static $groups = array();
        if (isset($groups[$uid]))
            return $groups[$uid];

        $user_groups = \think\Db::name($this->_config['AUTH_GROUP_ACCESS'] . ' a')
            ->where("a.uid='$uid' and g.status='1'")
            ->join($this->_config['AUTH_GROUP'] . ' g' , "a.group_id=g.id")
            ->field('rules')->select();

        $groups[$uid] = $user_groups ?: array();
        return $groups[$uid];
    }
根据用户id获取用户组,返回值为数组
@param  uid int     用户id
@return array       用户所属的用户组 array(
array('uid'=>'用户id','group_id'=>'用户组id','title'=>'用户组名称','rules'=>'用户组拥有的规则id,多个,号隔开'),
...)