Save / Output HTML form

I have a custom html calculating form in WordPress. I would like to know whether I can create a button, which first prints /saves the form to PDF, and then email's it to the relevant staff (and also including the person who completed the form)

I have this so far, which only sends an email to the address specified in the contact form, and not to a default address as well.

<?php
/*
Template Name: Contact
*/
?>
 
<?php
if(isset($_POST['submitted'])) {
    if(trim($_POST['contactName']) === '') {
        $nameError = 'Please enter your name.';
        $hasError = true;
    } else {
        $name = trim($_POST['contactName']);
    }
 
    if(trim($_POST['email']) === '')  {
        $emailError = 'Please enter your email address.';
        $hasError = true;
    } else if (!preg_match("/^[[:alnum:]][a-z0-9_.-]*@[a-z0-9.-]+\.[a-z]{2,4}$/i", trim($_POST['email']))) {
        $emailError = 'You entered an invalid email address.';
        $hasError = true;
    } else {
        $email = trim($_POST['email']);
    }
 
    if(trim($_POST['comments']) === '') {
        $commentError = 'Please enter a message.';
        $hasError = true;
    } else {
        if(function_exists('stripslashes')) {
            $comments = stripslashes(trim($_POST['comments']));
        } else {
            $comments = trim($_POST['comments']);
        }
    }
 
    if(!isset($hasError)) {
        $emailTo = get_option('tz_email');
        if (!isset($emailTo) || ($emailTo == '') ){
            $emailTo = get_option('admin_email');
        }
        $subject = '[PHP Snippets] From '.$name;
        $body = "Name: $name \n\nEmail: $email \n\nComments: $comments";
        $headers = 'From: '.$name.' <'.$emailTo.'>' . "\r\n" . 'Reply-To: ' . $email;
 
        wp_mail($emailTo, $subject, $body, $headers);
        $emailSent = true;
    }
 
} ?>
 
<?php get_header() ?>
 
    <div id="container">
        <div id="content">
            <?php the_post() ?>
            <div id="post-<?php the_ID() ?>" class="post">
                <div class="entry-content">
<form action="<?php the_permalink(); ?>" id="contactForm" method="post">
    <ul>
        <li>
            <label for="contactName">Name:</label>
            <input type="text" name="contactName" id="contactName" value="" />
        </li>
        <li>
            <label for="email">Email</label>
            <input type="text" name="email" id="email" value="" />
        </li>
        <li>
            <label for="commentsText">Message:</label>
            <textarea name="comments" id="commentsText" rows="20" cols="30"></textarea>
        </li>
        <li>
            <button type="submit">Send email</button>
        </li>
    </ul>
    <input type="hidden" name="submitted" id="submitted" value="true" />
</form>
 
                </div><!-- .entry-content ->
            </div><!-- .post-->
        </div><!-- #content -->
    </div><!-- #container -->
 
 
<?php get_footer() ?>

Code (markup):

 

Go to the following URL, which is an excellent resource, for an example of how to use PHP to create a PDF file. You can then attach the file to an email you send using the PHP mail function.

http://www.sitepoint.com/generate-pdfs-php/

 

Thank you. I have installed the library, and it is finding it.
It starts creating the pdf, but then an error pops up saying "file does not begin with '%PDF' ?

What could be causing this error?