由于某些原因，当我按下“提交”按钮时，它将再次加载相同的URL，并且页面为空白。当我单击提交按钮时，它应该会加载一个新的谢谢页面，其中包含一般信息。如果您查看我的位置标头网址，它会显示应该加载的感谢网址，但是这就像我的页面完全忽略了加载感谢页面，而仅加载相同的注册页面，但显示为完全空白。
<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', 'db', 'psw', 'db_folder')
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
$query = "INSERT INTO email_list (first_name, last_name, email) " .
"VALUES ('$first_name', '$last_name', '$email')";
$result = mysqli_query($dbc, $query)
or die('Error querying database.');
mysqli_close($dbc);
$to = '[email protected]';
$subject = 'New Signup';
$msg = "$first_name $last_name\n" .
"Email: $email\n";
$mail = mail($to, $subject, $msg, 'From:' . $email);
if($mail){
header("Location: http://www.example.com/thanks.php?fn=".$first_name);
exit();
}
}//end of validated data and adding recored to database. 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/signup/image.png" class="sign-up" alt="Sign Up"> </center>
<br>
<p>Sign Up</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>
</html>
header("location...");之后。尝试将其放在<div id="box">之前。