我正在嘗試使用 PHP 將 HTML 表單連接到 SQL 數(shù)據(jù)庫(kù)，但是當(dāng)我點(diǎn)擊提交時(shí)，它給了我 PHP 頁(yè)面。這是 HTML 代碼<form method="post" action="connect.php">    Username : <input type="text" name="username"><br><br>    Password : <input type="password" name="password"><br><br>    <input type="submit" value="Submit"></form>這是PHP代碼    $username = filter_input(INPUT_POST, 'username');    $password = filter_input(INPUT_POST, 'password');    if (!empty($username)){    if (!empty($password)){    $host = "localhost";    $dbusername = "root";    $dbpassword = "";    $dbname = "youtube";    // Create connection    $conn = new mysqli ($host, $dbusername, $dbpassword, $dbname);    if (mysqli_connect_error()){    die('Connect Error ('. mysqli_connect_errno() .') '    . mysqli_connect_error());    }    else{    $sql = "INSERT INTO account (username, password)    values ('$username','$password')";    if ($conn->query($sql)){    echo "New record is inserted sucessfully";    }    else{    echo "Error: ". $sql ."    ". $conn->error;    }    $conn->close();    }    }    else{    echo "Password should not be empty";    die();    }    }    else{    echo "Username should not be empty";    die();    }我希望得到“新記錄插入成功”或“錯(cuò)誤”