Integrating Validation Errors - Extra Credit

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

$error_message = array();
// 1. check if required fields are entered
if ($name == "" OR $email == "" OR $message == "") {
array_push($error_message, "You must specify a         value for name, email and message.");
}

// 2. check if fields have malicious code and if     $error_message is NOT set from 1. check
if (!isset($error_message)) {
foreach ($_POST as $value) {
if (stripos($value, 'Content-Type:') !== FALSE) {
    array_push($error_message, "There was a problem with the information you entered");
}
}
}
// 3. check if hidden address input is left blank and if $error_message is already filled with 1. or 2.
if (!isset($error_message) && $_POST["address"] != "") {
array_push($error_message, "Your form submission has an error.");
}

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

// 4. check if email address is a valid format
if (!isset($error_message) && !$mail->ValidateAddress($email)) {
array_push($error_message, "You must specify a valid email address.");
}

//To-Do send email
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 = "m4dcro@gmail.com";
$mail->AddAddress($address, "Shirts 4 Mike");
$mail->Subject = "Shirts 4 Mike Contact Form Submission | " . $name;
$mail->MsgHTML($email_body);

if ($mail->Send()) {
header("Location: contact.php?status=thanks");
exit;
} else {
array_push($error_message, "There was a problem sending the email: " . $mail->ErrorInfo);
}
}
}

?><?php
$pageTitle = "Contact Mike";
$section = "contact";
include('inc/header.php'); ?>

<div class="section page">

<div class="wrapper">

<h1>Contact</h1>

<?php
if(isset($_GET["status"]) AND     $_GET["status"]=="thanks"){ ?>
       <p>Thanks for the message!</p>
<?php } else { ?>

<?php
    if (!isset($error_message)) {
        echo '<p>Love to hear from you! Complete the form to send me an email.</p>';
    }
    foreach ($error_message as $error) {
        echo '<p class="message">' . $error . '</p><br>';
        exit;
    }
    ?>

    <form action="contact.php" method="post">

        <table>
            <tr>
                <th>
                    <label for="name">Name </label>
                </th>
                <td>
                    <input type="text" name="name" id="name" value="<?php if       (isset($name)) {echo
                    htmlspecialchars($name);} ?>"/>
                </td>
            </tr>

            <tr>
                <th>
                    <label for="email">Email </label>
                </th>
                <td>
                    <input type="text" name="email" id="email" value="<?php if (isset($email)) {echo
                    htmlspecialchars($email);} ?>"/>
                </td>
            </tr>

            <tr>
                <th>
                    <label for="name">Message </label>
                </th>
                <td>
                    <textarea name="message" id="message"><?php if (isset($message)) {  echo
                        htmlspecialchars($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: please leave this field blank.</p>
                </td>
            </tr>
        </table>
        <input type="submit" value="Send"/>
    </form>
<?php } ?>

</div>
</div>


<?php include('inc/footer.php'); ?>