$select_re_id=$cnx->query("select count(*) c from Yid where pid=‘".$pid."‘ and gid=‘".$gid."‘ and prid=‘".$prid."‘ and cid=‘".$cid."‘ and did=‘".$did."‘");//判定是否为空foreach($select_re_id as $reid){if ($reid[‘c‘]==‘0‘){$cnx->query("INSERT INTO Yid (pid,gid,prid,cid,did) VALUES (‘".$pid."‘,‘".$gid."‘,‘".$prid."‘,‘".$cid."‘,‘".$did."‘)");//添加语句}else{echo "此组合已经存在！";}