我创建了此注册页面。问题是当我输入信息后单击提交时，什么也没有发生。它只是刷新同一页面。输入的信息应在我点击“提交”后导入到我的数据库中，并在提交后显示感谢您注册的消息。请帮忙。我试图通过在一个页面上而不是2个单独的文件上实现html和php代码，将所有内容都保留在单个页面中。
<html>
<body>
<?php
$output_form = true; //declare a FLAG we can use to test whether or not to show form
$first_name = NULL;
$last_name = NULL;
$email = NULL;
if (isset($_POST['submit']) ) { //conditional processing based on whether or not the user has submitted.
$dbc = mysqli_connect('localhost', 'name', 'pswd', 'database')
or die('Error connecting to MySQL server.');
$first_name = mysqli_real_escape_string($dbc, trim($_POST['firstname']));
$last_name = mysqli_real_escape_string($dbc, trim($_POST['lastname']));
$email = mysqli_real_escape_string($dbc, trim($_POST['email']));
$output_form = false; // will only change to TRUE based on validation
//Validate all form fields
if (empty($first_name)) {
echo "WAIT - The First Name field is blank <br />";
$output_form = true; // will print form.
}
if (empty($last_name)) {
echo "WAIT - The Last Name field is blank <br />";
$output_form = true; // will print form.
}
if (empty($email)) {
echo "WAIT - The Email field is blank <br />";
$output_form = true; // will print form.
}
if ((!empty($first_name)) && (!empty($last_name)) && (!empty($email))) {
//End of form validation
//This section establishes a connection to the mysqli database, and if it fails display error message
$query = "INSERT INTO quotes (first_name, last_name, email, " .
"VALUES ('$first_name', '$last_name', '$email')";
$result = mysqli_query($dbc, $query)
or die('Error querying database.');
mysqli_close($dbc);
$to = '[email protected]';
$subject = 'New Customer';
$msg = "$first_name $last_name\n" .
"Email: $email\n";
$mail = mail($to, $subject, $msg, 'From:' . $email);
if($mail){
header("Location: https://www.locate.com/blue.php".$first_name);
exit();
}
//Display the user input in an confirmation page
echo "<body style='margin-top: 100px; background-color: #f2f0e6;'><p style = 'color: #000000; text-align: center;font-size:300%; font-family:Arial, Helvetica, sans-serif;'><strong>Thanks for signing up!</strong></p><center><p style = 'color: #000000; text-align: center;font-size:200%; font-family:Arial, Helvetica, sans-serif;'>Contact us for any questions
</p>
</center>
</body>";
}//end of validated data and adding recored to databse. Closes the code to send the form.
} //end of isset condition. This closes the isset and tells us if the form was submitted.
else { //if the form has never been submitted, then show it anyway
$output_form = true;
}
if ( $output_form ) { //we will only show the form if the user has error OR not submitted.
?>
<div id="box">
<center><img src="../../images/duck.jpg" class="sign-up" alt="Sign Up"></center>
<br>
<p>Sign Up to get Discount Code</p><br>
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?> ">
<div>
<label for="firstname">First name:</label>
<input type="text" id="firstname" name="firstname" size="37" maxlength="37" value=" <?php echo $first_name; ?>" />
</div>
<div>
<label for="lastname">Last name:</label>
<input type="text" id="lastname" name="lastname" size="37" maxlength="37" value="<?php echo $last_name; ?>" />
</div>
<div>
<label for="email">Email:</label>
<input type="text" id="email" name="email" size="37" maxlength="37" value="<?php echo $email; ?>" />
</div>
<div id="submit">
<input type="submit" name="Submit" value="Submit" />
</div>
</center>
</form>
</div>
<?php
}
?>
</body>
您要的是$ _POST ['submit']而不是$ _POST ['Submit']