Enhancing a simple php app > Displaying the error message

    <?php 

if ($_SERVER["REQUEST_METHOD"] == "POST") {
$name = trim($_POST["name"]);
$email = trim($_POST["email"]);
$message = trim($_POST["message"]);

if ($name == "" OR $email == "" OR $message) {
    $error_message = "You must specify a value for name, email and message.";
}

if (!isset($error_message)) {
    foreach( $_POST as $value ){
          if( stripos($value,'Content-Type:') !== FALSE ){
            $error_message = "There was a problem with the information  you entered.";
          }
    }
}

if (!isset($error_message) && $_POST["address"] != "") {
    $error_message = "Your form submission has an error.";
}

require_once("includes/phpmailer/class.phpmailer.php");
$mail = new PHPMailer();

if (!isset($error_message) && !$mail->ValidateAddress($email)) {
    $error_message = "You must specify a valid email address.";
}

if (!isset($error_message)) {
    $email_body = "";
    $email_body = $email_body . "Name: " . $name . "<br>";
    $email_body = $email_body . "Email: " . $email . "<br>";
    $email_body = $email_body . "Message: " . $message;

    $mail->SetFrom($email, $name);
    $address = "orders@shirts4mike.com";
    $mail->AddAddress($address, "Shirts 4 Mike");
    //Set the subject line
    $mail->Subject = 'Shirts 4 Mike Contact Form Sumbission | ' . $name;
    //Read an HTML message body from an external file, convert referenced images to embedded, convert HTML into a basic plain-text alternative body
    $mail->MsgHTML($email_body);    
    //Send the message, check for errors
    if($mail->Send()) {
        header("Location: contact.php?status=thanks");
        exit;
    } else {
      $error_message = "There was an error sending the email: " . $mail->ErrorInfo;
    }

}

<div class="section page">

    <div class="wrapper">

        <h1>Contact</h1>

        <?php if (isset($_GET["status"]) AND $_GET["status"] == "thanks") { ?>
        <p>Thanks for the email! I&rsquo;ll be in touch shortly.</p>
        <?php } else { ?>

            <?php
                if (!isset($error_message)) {
                    echo '<p>I&rsquo;d love to hear from you! Complete the form to send me an email.</p>';
                    } else {
                    echo '<p class= "message">' . $error_message . '</p>';
                }
            ?>

            <form method="post" action="contact.php">
                <table>
                    <tr>
                        <th>
                            <label for="name">Name</label>
                        </th>
                        <td>
                            <input type="text"name="name" id="name">
                        </td>
                    </tr>
                    <tr>
                        <th>
                            <label for="email">Email</label>
                        </th>
                        <td>
                            <input type="text"name="email" id="email">
                        </td>
                    </tr>
                    <tr>
                        <th>
                            <label for="message">Message</label>
                        </th>
                        <td>
                            <textarea name="message" id="message"></textarea>
                        </td>
                    </tr>
                    <tr style="display: none;">
                        <th>
                            <label for="address">Address</label>
                        </th>
                        <td>
                            <input type="text"name="address" id="address">
                            <p>Humans (and frogs): Please leave this field blank.</p>
                        </td>
                    </tr>
                </table>
                <input type="submit" value="Send">
            </form>

        <?php } ?>
    </div>

</div>

<?php include("includes/footer.php"); ?>