php中，mysql实现数组式条件查询

$answer_username=$dblink->mem_fetch_array("SELECT uid FROM `cy_member` WHERE username LIKE '%".$_GET ['answername']."%'");
		$anser_ids='';
		foreach ($answer_username as $answer_username){
			$anser_ids.="".$answer_username['uid'].",";
		}
		$anser_ids=rtrim($anser_ids,',');
		if($anser_ids){
			$answernamestr ="…… where q.answername like '%" . $_GET ['answername'] . "%' or q.auid in ($anser_ids)" : '';