set_charset("utf8"); //2.刪除記錄 $str = ""; if(isset($_POST['t1']))$str = $_POST['t1']; if($conn->query("delete from books where 書籍編號=".$str)) echo "成功刪除"; else echo "無法刪除"; //3.查詢最新的資料表books $result = $conn->query("select * from books"); //4.輸出全部資料 $all = $result->fetch_all(MYSQLI_BOTH); ?>