9dian房间guan理系统(12)

/**
 * 解析group by
 * @param unknown $group
 * @return string
 */
public static function parseGroup($group){
$groupStr='';
if(is_array($group)){
$groupStr.=' GROUP BY '.implode(',',$group);

}elseif(is_string($group)&&!empty($group)){
$groupStr.=' GROUP BY '.$group;
}
return empty($groupStr)?'':$groupStr;
}