php - 表单不会将数据提交到 MySQL 数据库

Question

我有 1 个包含 html 表单的文件和另一个包含以下代码的 php 文件。当我单击提交按钮时，我能够成功连接。但是当我在 phpMyAdmin 控制面板中刷新数据库时。没有数据被推送到我的数据库。

HTML 表单

<form class="well" id="contactForm" name="sendMsg" novalidate="" action="contact_form.php" method="post">
        <div class="control-group">
            <div class="controls">
                <input class="form-control" name="fullname" id="name" type="text" placeholder="Full Name" required="" data-validation-required-message="Please enter your name" />
            </div>
        </div>
        <div class="control-group">
            <div class="controls">
                <input class="form-control" name="phonenumber" id="phone" type="text" placeholder="Phone Number" required="" data-validation-required-message="Please enter your phone number" />
            </div>
        </div>
        <div class="control-group">
            <div class="controls">
                <input class="form-control" name="emailaddress" id="email-address" type="email" placeholder="Email Address" required="" data-validation-required-message="Please enter your email" />
            </div>
        </div>
        <div class="control-group">
            <div class="controls">
                <textarea rows="6" class="form-control" name="message" id="msg" type="msg" placeholder="Enter detailed question/concern, and we will get back to you." required="" data-validation-required-message="Please enter your question/concern"></textarea>
            </div>
        </div>
        <div class="control-group">
            <div class="controls submit-btn">
                <button class="btn btn-primary" type="submit" value="Submit">Submit</button>
            </div>
        </div>
    </form>

CONTACT_FORM.PHP

<?php

define('DB_NAME', 'xxx');
define('DB_USER', 'xxx');
define('DB_PASSWORD', 'xxx');
define('DB_HOST', 'xxx');

$connection = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD);

if(!$connection){
die('Database connection failed: ' . mysqli_connect_error());
}

$db_selected = mysqli_select_db($connection, DB_NAME);

if(!$db_selected){
die('Can\'t use ' .DB_NAME . ' : ' . mysqli_connect_error());
}

echo 'Connected successfully';

$name = @$_POST ['fullname'];
$phone = @$_POST ['phonenumber'];
$email = @$_POST ['emailaddress'];
$msg = @$_POST ['message'];

$sql = "INSERT INTO contact_form (fullname, phonenumber, emailaddress, message) VALUES ('$name',   '$phone', '$email', '$msg')";

if (!mysqli_query($connection, $sql)){
die('Error: ' . mysqli_connect_error($connection));
}
?>

Answer 1

首先使用该结构:

if (isset($_POST['fullname'])) {
    $name = $_POST['fullname'];
}

其他值依此类推。

或者更好:-

$name = isset($_POST['fullname']) ? $_POST['fullname'] : '';

这样，字段 $name 始终设置为某个值，这样当您稍后在代码中尝试使用它时就不会出现错误