递归查询获取子项目

 0){
    $curStr = implode(',', $curData);
    $sql = "select id from kjj_group_info where pid in ({$curStr})";
    $nextData = $pdo->fetchData($sql);
    $retData =array_merge($retData, $curData);
    $curData =$func->arrayColumn($nextData, 'id');
  }
  return $retData;
}