php problem

<?php

// Replace this with your own email address
$siteOwnersEmail = 'thegamezbus@gmail.com';


if($_POST) {

   $fullname = trim(stripslashes($_POST['contactfullname']));
   $childname = trim(stripslashes($_POST['contactchildname']));
   $groupage = trim(stripslashes($_POST['contactgroupage']));
   $numberchildren = trim(stripslashes($_POST['contactnumberchildren']));
   $partydate = trim(stripslashes($_POST['contactpartydate']));
   $partyhour = trim(stripslashes($_POST['contactpartyhour']));
   $email = trim(stripslashes($_POST['contactemail']));
   $phonenumber = trim(stripslashes($_POST['contactphonenumber']));
   $fulladdress = trim(stripslashes($_POST['contactfulladdress']));
   $package = trim(stripslashes($_POST['contactpackage']));
   $extras = trim(stripslashes($_POST['contactextras']));

   // Check Full Name
    if (strlen($fullname) < 2) {
        $error['fullname'] = "Please enter your full name.";
    }
    // Check Child Name
    if (strlen($childname) < 2) {
        $error['childname'] = "Please enter your child's name'.";
    }
    // Check Group Age
    if (strlen($groupage) < 2) {
        $error['groupage'] = "Please enter the age of the child.";
    }
    // Check Number Of Children
    if (strlen($numberchildren) < 1) {
        $error['numberchildren'] = "Please enter the number of expected children.";
    }
    // Check Date of Party
    if (strlen($partydate) < 1) {
        $error['partydate'] = "Please enter the date of the party.";
    }
    // Check Time of party
    if (strlen($partyhour) < 1) {
        $error['partyhour'] = "Please enter the time of the party.";
    }
    // Check Email
    if (!preg_match('/^[a-z0-9&\'\.\-_\+]+@[a-z0-9\-]+\.([a-z0-9\-]+\.)*+[a-z]{2}/is', $email)) {
        $error['email'] = "Please enter a valid email address.";
    }
    // Check Full Address
    if (strlen($fulladdress) < 1) {
        $error['fulladdress'] = "Please enter your full address.";
    }
    // Check Phone Number
    if (strlen($phonenumber) < 1) {
        $error['phonenumber'] = "Please enter your phone number."
    }
    // Check Package Required
    if (strlen($package) < 1) {
        $error['package'] = "Please enter the package required.";
    }


   // Subject
    if ($subject == '') { $subject = "Contact Form Submission"; }

    // Set Name
    $name = $fullname;

   // Set Message
   $message .= "Email from: " . $name . "<br />";
   $message .= "Child Name: " . $childname . "<br />";
   $message .= "Group Age: " . $groupage . "<br />";
   $message .= "Number Of Children: " . $numberchildren . "<br />";
   $message .= "Date Of Party: " . $partydate . "<br />";
   $message .= "Time Of Party: " . $partyhour . "<br />";
   $message .= "Email Address: " . $email . "<br />";
   $message .= "Phone Number: " . $phonenumber . "<br />";
   $message .= "Full Address: " . $fulladdress . "<br />";
   $message .= "Package Requirements: " . $package . "<br />";
   $message .= "Aditional Services: " . $extras . "<br />";
   $message .= "Message: <br />";
   $message .= "<br /> ----- <br /> This email was sent from the GamezBus site's contact form. <br />";

   // Set From: header
   $from =  $name . " <" . $email . ">";

   // Email Headers
    $headers = "From: " . $from . "\r\n";
    $headers .= "Reply-To: ". $email . "\r\n";
    $headers .= "MIME-Version: 1.0\r\n";
    $headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";


   if (!$error) {

      ini_set("sendmail_from", $siteOwnersEmail); // for windows server
      $mail = mail($siteOwnersEmail, $fullname, $email, $phonenumber, $fulladdress, $headers);

        if ($mail) { echo "OK"; }
      else { echo "Something went wrong. Please try again."; }

    } # end if - no validation error

    else {

        $response .= (isset($error['fullname'])) ? $error['fullname'] . "<br /> \n" : null;
        $response .= (isset($error['childname'])) ? $error['childname'] . "<br /> \n" : null;
        $response .= (isset($error['groupage'])) ? $error['groupage'] . "<br /> \n" : null;
        $response .= (isset($error['numberchildren'])) ? $error['numberchildren'] . "<br />" : null;
        $response .= (isset($error['partydate'])) ? $error['partydate'] . "<br /> \n" : null;
        $response .= (isset($error['partyhour'])) ? $error['partyhour'] . "<br /> \n" : null;
        $response .= (isset($error['email'])) ? $error['email'] . "<br /> \n" : null;
        $response .= (isset($error['phonenumber'])) ? $error['phonenumber'] . "<br />" : null;
        $response .= (isset($error['fulladdress'])) ? $error['fulladdress'] . "<br /> \n" : null;
        $response .= (isset($error['package'])) ? $error['package'] . "<br /> \n" : null;
        $response .= (isset($error['othercomments'])) ? $error['othercomments'] . "<br /> \n" : null;


        echo $response;

    } # end if - there was a validation error

}

?><!DOCTYPE html>
<!--[if lt IE 8 ]><html class="no-js ie ie7" lang="en"> <![endif]-->
<!--[if IE 8 ]><html class="no-js ie ie8" lang="en"> <![endif]-->
<!--[if IE 9 ]><html class="no-js ie ie9" lang="en"> <![endif]-->
<!--[if (gte IE 9)|!(IE)]><!-->

<html class="no-js" lang="en">
    <!--<![endif]-->

    <head>

        <!--- Basic Page Needs ================================================== -->
        <meta charset="utf-8">

        <title>GamezBus Booking Form</title>

        <meta name="description" content="games, bus, gamesbus, games bus, busgames, bus games, cre8, duncan, gamezbus">

        <meta name="author" content="Bulciu Vasile Andrei">

        <!-- Mobile Specific Metas ================================================== -->
        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">

        <!-- CSS ================================================== -->
        <link rel="stylesheet" href="css/base.css">

        <link rel="stylesheet" href="css/main.css">

        <link rel="stylesheet" href="css/media-queries.css">

        <!-- Script =================================================== -->
        <script src="js/modernizr.js"></script>

        <!-- Favicons =================================================== -->
        <link rel="shortcut icon" href="favicon.png" >

    </head>

    <body class="homepage">

        <div id="preloader">

            <div id="status">

                <img src="images/loader.gif" height="60" width="60" alt="">

                <div class="loader">
                    Loading...
                </div>

            </div>

        </div>

        <!-- About Section ================================================== -->
        <section id="about">

            <div class="row section-head">

                <div class="twelve columns">

                    <h1>Booking Form<span>.</span></h1>

                    <hr />

                    <h2><b>The Gamez Bus</b></h2>
                    <h3><b>Cre8 Solutions Ltd, 181 Forest Road, Fairlop, Essex, IG6 3HZ</b></h3>
                    <hr />
                    <br />
                    <p>
                        Please also note that apart from the GamezBus, we offer the following aditional services:
                    </p>

                    <p>
                        Mega gaming Party bags - £10 per child
                    </p>
                    <p>
                        Cold drinks package £2 per child
                    </p>
                    <p>
                        Sweets, crisps and drinks package £10 per child
                    </p>
                    <p>
                        Fruit and healthy snack packs £10 per child
                    </p>
                    <p>
                        Adult refreshments including coffee, tea etc. served on day at additional cost
                    </p>
                    <p>
                        If any aditional services are required, please mention them in the "Other extras" box on the order form
                    </p>
                    <br />
                    <p>
                        Games Required: Please specify any games required by children, We carry a full range of the latest games on-board however, we prefer to be told of any must have titles.
                    </p>
                    <br />

                    <h1>Complete the form below and we will get back to you as soon as possible. Thank you</h1>
                </div>

            </div>

            <!-- About Section ================================================== -->

            <!-- Form Section ================================================== -->

            <div class="row form-section">

                <div id="order-form" class="twelve columns">

                    <form name="orderForm" id="orderForm" method="post" action="">

                        <fieldset>

                            <div class="row">

                                <div class="six columns mob-whole">

                                    <label for="contactfullname">Full Name<span class="required">*</span></label>

                                    <input name="contactfullname" type="text" id="contactfullname" placeholder="Full Name" value="" />

                                </div>

                                <div class="six columns mob-whole">

                                    <label for="contactchilname">Child Name<span class="required">*</span></label>

                                    <input name="contactchilname" type="text" id="contactchilname" placeholder="Child Name" value="" />

                                </div>

                            </div>

                            <div class="row">

                                <div class="six columns mob-whole">

                                    <label for="contactgroupage">Group Age<span class="required">*</span></label>

                                    <input name="contactgroupage" type="text" id="contactgroupage" placeholder="Group Age" value="" />

                                </div>

                                <div class="six columns mob-whole">

                                    <label for="contactnumberchildren">Number Of Children<span class="required">*</span></label>

                                    <input name="contactnumberchildren" type="text" id="contactnumberchildren" placeholder="Number of children" value="" />

                                </div>

                            </div>

                            <div class="row">

                                <div class="six columns mob-whole">

                                    <label for="contactpartydate">Date of Party<span class="required">*</span></label>

                                    <input name="contactpartydate" type="text" id="contactpartydate" placeholder="Date of party" value="" />

                                </div>

                                <div class="six columns mob-whole">

                                    <label for="contactpartyhour">Time of party<span class="required">*</span></label>

                                    <input name="contactpartyhour" type="text" id="contactpartyhour" placeholder="Time of Party"  value="" />

                                </div>

                            </div>

                            <div class="row">

                                <div class="six columns mob-whole">

                                    <label for="contactemail">Email Address<span class="required">*</span></label>

                                    <input name="contactemail" type="text" id="contactemail" placeholder="Email" value="" />

                                </div>

                                <div class="six columns mob-whole">

                                    <label for="contactphonenumber">Phone Number<span class="required">*</span></label>

                                    <input name="contactphonenumber" type="text" id="contactphonenumber" placeholder="Number" value="" />

                                </div>

                            </div>

                            <div class="row">

                                <div class="six columns mob-whole">

                                    <label for="contactfulladdress">Full Address<span class="required">*</span></label>
                                    <textarea name="contactfulladdress"  id="contactfulladdress" placeholder="Full Address" rows="1" cols="50" ></textarea>



                                </div>

                            </div>

                            <div class="row">

                                <div class="six columns mob-whole">

                                    <label for="contactpackage">Package Required<span class="required">*</span></label>
                                    <textarea name="contactpackage"  id="contactpackage" placeholder="Briefly explain what your booking would contain." rows="10" cols="50" ></textarea>



                                </div>

                                <div class="six columns mob-whole">

                                    <label for="contactextras">Other Extras</label>
                                    <textarea name="contactextras"  id="contactextras" placeholder="Please feel free to add any optional extras here." rows="10" cols="50" ></textarea>



                                </div>

                            </div>

                            <hr />

                            <div>
                                <button class="submit full-width">
                                    Send Message
                                </button>

                                <div id="image-loader">
                                    <img src="images/loader.gif" alt="" />

                                </div>

                            </div>

                        </fieldset>

                    </form>
                    <!-- /orderForm -->

                    <!-- message box -->
                    <div id="message-warning">

                    </div>

                    <div id="message-success">

                        <i class="fa fa-check"></i>Your message was sent, thank you!
                        <br />

                    </div>

                </div>
                <!-- /order-form -->

            </div>
            <!-- /form-section -->

            <!-- /Form Section ================================================== -->

            <!-- Footer ================================================== -->
            <footer>

                <div class="row">

                    <div class="six columns tab-whole right-cols">

                        <p class="homepage">
                            <a href="index.html">Back To The Homepage</a>
                        </p>

                    </div>
                    <!-- /row -->

                    <div class="row">

                        <div class="six columns tab-whole right-cols">

                            <p class="copyright">
                                &copy; Copyright 2015 <a href="http://www.facebook.com/gamezbus">Gamezbus</a>. Design by <a href="http://www.facebook.com/andreipath">Bulciu Vasile Andrei.</a>
                            </p>

                        </div>
                        <!-- /row -->

            </footer>
            <!-- /footer -->

            <!-- Java Script ================================================== -->
            <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>

            <script>
                window.jQuery || document.write('<script src="js/jquery-1.10.2.min.js"><\/script>')

            </script>

            <script type="text/javascript" src="js/jquery-migrate-1.2.1.min.js"></script>

            <script src="js/jquery.flexslider.js"></script>

            <script src="js/jquery.fittext.js"></script>

            <script src="js/backstretch.js"></script>

            <script src="js/waypoints.js"></script>

            <script src="js/main.js"></script>

    </body>

</html>