表单必须在 php 中的成功消息之前单击提交两次

Question

我正在尝试做一个预订/预订页面，所以我有一个表格，可以从用户那里获取信息以及他们想要的服务的详细信息，并将其添加到数据库中。 我可以毫无问题地插入记录，例如记录只记录一次，如果数据成功插入，则显示成功消息，否则应遵循失败消息。 问题是单击提交按钮两次或页面刷新后会显示该消息。

这是消息代码的外观：

    if ($res_bookings){
        
        $_SESSION['done'] = "<h2 class='success'>BOOKED SUCCESSFULLY</h2>";
       
    } else {
        $_SESSION['done'] = "<h2 class='failed'>BOOKING FAILED</h2>";
    }

而对于整个 php 代码

<?php

//to get data from form

    if(isset($_POST['submit'])){
    //assign values
    $customer_name = mysqli_real_escape_string($conn, $_POST['customer_name']);
    $customer_number = mysqli_real_escape_string($conn ,$_POST['customer_number']);
    $customer_email = mysqli_real_escape_string($conn, $_POST['customer_email']);
    $event_type = mysqli_real_escape_string($conn, $_POST['event']);
    $start = mysqli_real_escape_string($conn, $_POST['event_start']);
    $end = mysqli_real_escape_string($conn, $_POST['event_end']);
    $address = mysqli_real_escape_string($conn, $_POST['event_address']);
    $menus = $_POST['menu'];
    $extras = $_POST['extra'];
    $booking_id = rand(000, 999);
    $event_id = rand(000, 999);
    $payment_id = rand(000, 999);
    
    //no empty values to be inserted in database
    if($customer_name == ""){
        $_SESSION['name'] = "<p class='failed'>PLEASE FILL NAME</p>";

        die();
    }

    if($customer_number == "" && $customer_email == ""){
        $_SESSION['contacts'] = "<p class='failed'>PLEASE FILL CONTACTS</p>";

        die();
    }

    if(empty($menus) || empty($extras)){
        $_SESSION['menu'] = "<p class='failed'>PLEASE PICK YOUR MENU OR EXTRAS</p>";

        die();
    }


     ////for storing event details to event_details table
    $query = "INSERT INTO event_details
        SET id = ?,
        startTime = ?,
        endTime = ?,
        eventAddress = ?,
        event_type = (
            SELECT id 
            FROM events
            WHERE id = ?);";

    $stmt = $conn->prepare($query);
    $stmt->bind_param("isssi", $event_id, $start, $end, $address, $event_type);
    $res_event = $stmt->execute();

    if (!$res_event){
        echo $conn->error;
    }

    //create booking record
    $query_2 = "INSERT INTO bookings
        SET id = ?,
        customer_name = ?,
        customer_contact_no = ?,
        customer_email = ?,
        eventID = (
            SELECT id
            FROM event_details
            WHERE id = ?);";

    $stmt_2 = $conn->prepare($query_2);
    $stmt_2->bind_param("isssi", $booking_id, $customer_name, $customer_number, $customer_email, $event_id);
    $res_book = $stmt_2->execute();
    
    if (!$res_book){
        echo $conn->error;
    }
    
    //create menu record
    $menu_query = "INSERT INTO menus_bookings
        SET
        bookingID = (
            SELECT id
            FROM bookings
            WHERE id = ?),
        type = (
            SELECT id
            FROM menus_types
            WHERE id = ?);";

    $menu_stmt = $conn->prepare($menu_query);
    $menu_stmt->bind_param("ii", $booking_id, $menu);

    foreach ($menus as $menu){
       $res_menu = $menu_stmt->execute();
    }

    if(!$res_menu){
        echo $conn->error;
    }

    ///create extras record
    $extras_query = "INSERT INTO extras_bookings
        SET
        bookingID = (
            SELECT id
            FROM bookings
            WHERE id = ?),
        type = (
            SELECT id
            FROM extras_types
            WHERE id = ?);";

    $extras_stmt = $conn->prepare($extras_query);
    $extras_stmt->bind_param("ii", $booking_id, $extra);

    foreach ($extras as $extra){
        $res_extras = $extras_stmt->execute();
    }


     if(!$res_extras){
         echo $conn->error;
     }

    //calculate fees
    $menu_sql = "SELECT SUM(mt.price) as 'menu total'
    FROM menus_types mt, menus_bookings mb
    WHERE mt.id = mb.type
    AND mb.bookingID = ?;";

    $stmt_menu = $conn->prepare($menu_sql);
    $stmt_menu->bind_param("i", $booking_id);
    $stmt_menu->execute();
    $result_menu = $stmt_menu->get_result();
    $row_menu = $result_menu->fetch_assoc();
    $menu_total = $row_menu['menu total'];

    $extras_sql = "SELECT SUM(et.price) as 'extras total'
    FROM extras_types et, extras_bookings eb
    WHERE et.id = eb.type
    AND eb.bookingID = ?;";

    $stmt_extras = $conn->prepare($extras_sql);
    $stmt_extras->bind_param("i", $booking_id);
    $stmt_extras->execute();
    $result_extras = $stmt_extras->get_result();
    $row_extras = $result_extras->fetch_assoc();
    $extras_total = $row_extras['extras total'];

    $total = $menu_total + $extras_total;
    $min = $total * .50;

    //create payment details
    $query_pay = "INSERT INTO payment_details
        SET id = ?,
        extras_total = ?,
        menus_total = ?,
        total = ?,
        minPayment = ?;
      ";

    $stmt_pay = $conn->prepare($query_pay);
    $stmt_pay->bind_param("iiiii", $payment_id, $extras_total, $menu_total, $total, $min);
    $res_pay = $stmt_pay->execute();

    if(!$res_pay){
        echo $conn->error;
    } 

    //add receipt to booking record
    $query_booking = "UPDATE bookings
        SET receiptID = (
            SELECT id 
            FROM payment_details
            WHERE id = ?)
        WHERE id = ?;
      ";

    $stmt_bookings = $conn->prepare($query_booking);
    $stmt_bookings->bind_param("ii", $payment_id, $booking_id);
    $res_bookings = $stmt_bookings->execute();

    if ($res_bookings){
        
        $_SESSION['done'] = "<h2 class='success'>BOOKED SUCCESSFULLY</h2>";
        
    } else {
        $_SESSION['done'] = "<h2 class='failed'>BOOKING FAILED</h2>";
    }
}
?>

我根本不习惯使用 PHP，但我认为问题出在 PHP 部分而不是 HTML 中。

Answer 1

您正在将此数据写入 $_SESSION 变量，而不是实际将其输出到页面。

如果您希望在提交表单后显示成功消息，请使用：

if ($res_bookings) {
    echo "<h2 class='success'>BOOKED SUCCESSFULLY</h2>";
} else {
    echo "<h2 class='failed'>BOOKING FAILED</h2>";
}

Answer 2

更改代码的最后一部分：

$stmt_bookings = $conn->prepare($query_booking);
$stmt_bookings->bind_param("ii", $payment_id, $booking_id);
$res_bookings = $stmt_bookings->execute();

if ($res_bookings){
    
    $_SESSION['done'] = "<h2 class='success'>BOOKED SUCCESSFULLY</h2>";
    
} else {
    $_SESSION['done'] = "<h2 class='failed'>BOOKING FAILED</h2>";
}

}

对此：

$stmt_bookings = $conn->prepare($query_booking);
$stmt_bookings->bind_param("ii", $payment_id, $booking_id);
$res_bookings = $stmt_bookings->execute();
    
$_SESSION['done'] = "<h2 class='success'>BOOKED SUCCESSFULLY</h2>";
    
} else {
    
 $_SESSION['done'] = "<h2 class='failed'>BOOKING FAILED</h2>";

}

这意味着在代码执行后立即显示成功消息，否则显示失败消息