如何让我的PHP表单重定向工作？

Question

I've created a form with the following html and php code, and basically it runs a check to see if the spam question has been completed successfully in which case it should process the form, send an email through and redirect the user to the thankyou.html page. However at the moment, on success, the form just reloads the same page and doesn't redirect to the thank you page, however I do receive a confirmation email...

Is there something I've missed off/got wrong in the code below to stop this from actioning?

<form id="form" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
    <table>
        <tr>
            <td align="right"><label for="name">Name:<span class="error"><?php echo $nameErr;?></span></label></td>
            <td><input type="text" name="name" id="name" /></td>
        </tr>
        <tr>
            <td align="right"><label for="email">Email:<span class="error"><?php echo $emailErr;?></span></label></td>
            <td><input type="text" name="email" id="email"  /></td>
        </tr>
        <tr>
            <td align="right"><label for="telephone">Telephone:<span class="error"><?php echo $telErr;?></span></label></td>
            <td><input name="telephone" type="text" id="telephone" /></td>
        </tr>
        <tr>
            <td align="right"><label for="field">Anti-spam question:<span class="error"><?php echo $spamErr;?></span></label></td>
            <td><input name="field" type="text" id="field" value="Complete the Beatles lyric: all you need is...?"  onfocus="if(this.value==this.defaultValue) this.value='';"  onblur="if(this.value == ''){this.value='Complete the Beatles lyric: all you need is...?';}" /></td>
        </tr>
        <tr>
            <td align="right"><label for="message">Message:</label></td>
            <td><textarea name="message"></textarea></td>
        </tr>
        <tr>
            <td colspan="2" align="right"><img src="images/contactdots.gif" width="338" height="10" alt="" /></td>
        </tr>
        <tr>
            <td colspan="2" align="right"><input id="button" type="Submit" value="SUBMIT" alt="submit" /></td>
        </tr>
    </table>
<?php

if($_SERVER['REQUEST_METHOD'] == "POST"){

// Pick up the form data and assign it to variables
$name = stripslashes($_POST['name']);
$email = stripslashes($_POST['email']);
$tel = $_POST['telephone'];
$comments = stripslashes($_POST['message']);
$field = strtolower($_POST['field']);
$spam_check = 'love';
if($field == $spam_check){
// Build the email (replace the address in the $to section with your own)
$to = '[e-mail]';
$subject = "The Vintage Affair Web Quote enquiry";
$comments = "Name: $name 
Email: $email 
Telephone: $tel 

Details: $comments";
$headers = "From: [e-mail]" . PHP_EOL . "Reply-To: [e-mail]";

// Send the mail using PHPs mail() function
mail($to, $subject, $comments, $headers);

// Redirect
header("Location: thankyou.html");
}
else{ echo '<div class="spam">*You got the Beatle\'s lyric wrong, please try again*</div>'; }
}

?>
</form>

Answer 1

The problem is you're outputting data before calling the header(), it won't work like this.

Put all the PHP above the form.