Php form error?

Question

Hi. I've got php form from one of the templates but it doesn't work. Can anyone see an error?
The code:
<div id="content_item">
          <h1>Contact Us</h1>
          <p>Say hello, using this contact form.</p>
          <?php
            // Set-up these 3 parameters
            // 1. Enter the email address you would like the enquiry sent to
            // 2. Enter the subject of the email you will receive, when someone contacts you
            // 3. Enter the text that you would like the user to see once they submit the contact form
            $to = [email protected];
            $subject = Enquiry from the website;
            $contact_submitted = Your message has been sent.;
            // Do not amend anything below here, unless you know PHP
            function email_is_valid($email) {
              return preg_match('/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i',$email);
            if (!email_is_valid($to)) {
              echo '<p style="color: red;">You must set-up a valid (to) email address before this contact page will work.</p>';
            if (isset($_POST['contact_submitted'])) {
              $return = "\r";
              $youremail = trim(htmlspecialchars($_POST['your_email']));
              $yourname = stripslashes(strip_tags($_POST['your_name']));
              $yourmessage = stripslashes(strip_tags($_POST['your_message']));
              $contact_name = "Name: ".$yourname;
              $message_text = "Message: ".$yourmessage;
              $user_answer = trim(htmlspecialchars($_POST['user_answer']));
              $answer = trim(htmlspecialchars($_POST['answer']));
              $message = $contact_name . $return . $message_text;
              $headers = "From: ".$youremail;
              if (email_is_valid($youremail) && !eregi("\r",$youremail) && !eregi("\n",$youremail) && $yourname != "" && $yourmessage != "" && substr(md5($user_answer),5,10) === $answer) {
                mail($to,$subject,$message,$headers);
                $yourname = '';
                $youremail = '';
                $yourmessage = '';
                echo '<p style="color: blue;">'.$contact_submitted.'</p>';
              else echo '<p style="color: red;">Please enter your name, a valid email address, your message and the answer to the simple maths question before sending your message.</p>';
            $number_1 = rand(1, 9);
            $number_2 = rand(1, 9);
            $answer = substr(md5($number_1+$number_2),5,10);
          ?>
          <form id="contact" action="contact.php" method="post">
            <div class="form_settings">
              <p><span>Name</span><input class="contact" type="text" name="your_name" value="<?php echo $yourname; ?>" /></p>
              <p><span>Email Address</span><input class="contact" type="text" name="your_email" value="<?php echo $youremail; ?>" /></p>
              <p><span>Message</span><textarea class="contact textarea" rows="5" cols="50" name="your_message"><?php echo $yourmessage; ?></textarea></p>
              <p style="line-height: 1.7em;">To help prevent spam, please enter the answer to this question:</p>
              <p><span><?php echo $number_1; ?> + <?php echo $number_2; ?> = ?</span><input type="text" name="user_answer" /><input type="hidden" name="answer" value="<?php echo $answer; ?>" /></p>
              <p style="padding-top: 15px"><span> </span><input class="submit" type="submit" name="contact_submitted" value="send" /></p>
            </div>
          </form>
        </div>

Answer 1

The only error I see is your text strings which are assigned to the php variables should be enclosed in "  " like below: (best not to post real email addresses as it attracts spam)
$to = "[email protected]";
            $subject = "Enquiry from the website";
            $contact_submitted = "Your message has been sent.";
Plus change the $return variable to a line break (as below) otherwise the information will come through in one continuous line.
$return = "\n\n";