spekkionu/contact.php

## contact.php
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>Contact Us</title>
        <link rel="stylesheet" href="styles.css">
        <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/sweetalert/1.1.3/sweetalert.min.css">
        <script src='//www.google.com/recaptcha/api.js' async defer></script>
    </head>
    <body>
        <form id="contact-form" action="sendmessage.php" method="post" accept-charset="utf-8" data-parsley-validate novalidate>
            <fieldset>
                <legend>Contact Us</legend>
                <div class="row">
                    <label for="name"><span style="color:red;">*</span>Name: </label>
                    <input id="name" type="text" name="name" required data-parsley-required-message="You must enter your name.">
                </div>
                <div class="row">
                    <label for="email"><span style="color:red;">*</span>Email Address: </label>
                    <input id="email" type="email" name="email" required data-parsley-required-message="You must enter your email address." parsley-type-email-message="You must enter a valid email address.">
                </div>
                <div class="row">
                    <label for="message"><span style="color:red;">*</span>Message:</label>
                    <textarea id="message" name="message" required data-parsley-required-message="You must enter a message."></textarea>
                </div>

                <div class="g-recaptcha" data-sitekey="PUBLIC_RECAPTCHA_KEY"></div>
                    <div class="row">
                        <input type="submit" value="Submit">
                    </div>
            </fieldset>
        </form>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/parsley.js/2.0.2/parsley.min.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/sweetalert/1.1.3/sweetalert.min.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/jquery.form/3.51/jquery.form.min.js"></script>
    <script type="text/javascript">
        $( document ).ready(function() {
            $('#contact-form').ajaxForm({
                dataType: 'json',
                success: function(response) {
                    grecaptcha.reset();
                    if(response.success) {
                        $('#contact-form').clearForm();
                        swal("Thank You!", "Your message has been sent!", "success")
                    } else if (response.errors) {
                        var messages = [];
                        $.each(response.errors, function(field, message) {
                            messages.push(message);
                        });
                        swal("Uh Oh!", messages.join("\n"), "error")
                    } else {
                        swal("Uh Oh!", "Failed to send your message!", "error")
                    }
                }
            });
        });
    </script>
</body>
</html>

## sendmessage.php
<?php

/**
 * Sends response as json
 *
 * @param  boolean $successful Was the action successful
 * @param  array   $errors     An array of any errors that occurred
 */
function sendJsonResponse($successful = true, $errors = [])
{
	header('Content-Type: application/json');
	echo json_encode(['success' => $successful, 'errors' => $errors]);
	exit;
}

// Load config file
$config = include(__DIR__ . '/config.php');

// Download from https://github.com/google/recaptcha
require(__DIR__ . '/recaptcha/src/autoload.php');
$recaptcha = new \ReCaptcha\ReCaptcha($config['recaptcha']['privatekey']);

$valid = true;
if (isset($_POST['g-recaptcha-response'])) {
    $resp = $recaptcha->verify($_POST['g-recaptcha-response'], $_SERVER['REMOTE_ADDR']);

    if (!$resp->isSuccess()) {
        $valid = false;
        $errors['captcha'] = "You must solve the CAPTCHA.";
    }

    $contact = filter_input_array(INPUT_POST, array(
        'name'   => FILTER_SANITIZE_STRING,
        'email'   => FILTER_SANITIZE_STRING,
        'message'   => FILTER_SANITIZE_STRING,
    ), true);
    if (empty($contact['name'])) {
        $valid = false;
        $errors['name'] = "You must enter your name.";
    }
    if (empty($contact['email'])) {
        $valid = false;
        $errors['email'] = "You must enter your email address.";
    } elseif (!filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL)) {
        $valid = false;
        $errors['email'] = "You must enter a valid email address.";
    }
    if (empty($contact['message'])) {
        $valid = false;
        $errors['message'] = "You must enter a message.";
    }

    if ($valid) {
        // The email address the email will be sent to
        $to = $config['contact']['to'];
        // Set the from address for the email
        $from = $config['contact']['from'];
        // The email subject
        $subject = "Contact Form Submission";
        // Set the from and reply-to address for the email
        $headers = "From: " . $from . "\r\n"
                 . "Reply-To: " . $contact['email'] . "\r\n"
                 . "X-Mailer: PHP/" . phpversion();
        // Build the body of the email
        $mailbody = "The contact form has been filled out.\n\n"
                  . "Name: " . $contact['name'] . "\n"
                  . "Email: " . $contact['email'] . "\n"
                  . "Message:\n" . $contact['message'];
        // Send the email
        mail($to, $subject, $mailbody, $headers);
        // Go to the thank you page
        sendJsonResponse(true);
    } else {
    	sendJsonResponse(false, $errors);
    }
}
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<title>Contact Us</title>
	<link rel="stylesheet" href="styles.css">
	<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/sweetalert/1.1.3/sweetalert.min.css">
	<script src='//www.google.com/recaptcha/api.js' async defer></script>
	</head>
	<body>
	<form id="contact-form" action="sendmessage.php" method="post" accept-charset="utf-8" data-parsley-validate novalidate>
	<fieldset>
	<legend>Contact Us</legend>
	<div class="row">
	<label for="name"><span style="color:red;">*</span>Name: </label>
	<input id="name" type="text" name="name" required data-parsley-required-message="You must enter your name.">
	</div>
	<div class="row">
	<label for="email"><span style="color:red;">*</span>Email Address: </label>
	<input id="email" type="email" name="email" required data-parsley-required-message="You must enter your email address." parsley-type-email-message="You must enter a valid email address.">
	</div>
	<div class="row">
	<label for="message"><span style="color:red;">*</span>Message:</label>
	<textarea id="message" name="message" required data-parsley-required-message="You must enter a message."></textarea>
	</div>

	<div class="g-recaptcha" data-sitekey="PUBLIC_RECAPTCHA_KEY"></div>
	<div class="row">
	<input type="submit" value="Submit">
	</div>
	</fieldset>
	</form>
	<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
	<script src="//cdnjs.cloudflare.com/ajax/libs/parsley.js/2.0.2/parsley.min.js"></script>
	<script src="//cdnjs.cloudflare.com/ajax/libs/sweetalert/1.1.3/sweetalert.min.js"></script>
	<script src="//cdnjs.cloudflare.com/ajax/libs/jquery.form/3.51/jquery.form.min.js"></script>
	<script type="text/javascript">
	$( document ).ready(function() {
	$('#contact-form').ajaxForm({
	dataType: 'json',
	success: function(response) {
	grecaptcha.reset();
	if(response.success) {
	$('#contact-form').clearForm();
	swal("Thank You!", "Your message has been sent!", "success")
	} else if (response.errors) {
	var messages = [];
	$.each(response.errors, function(field, message) {
	messages.push(message);
	});
	swal("Uh Oh!", messages.join("\n"), "error")
	} else {
	swal("Uh Oh!", "Failed to send your message!", "error")
	}
	}
	});
	});
	</script>
	</body>
	</html>
	<?php

	/**
	* Sends response as json
	*
	* @param boolean $successful Was the action successful
	* @param array $errors An array of any errors that occurred
	*/
	function sendJsonResponse($successful = true, $errors = [])
	{
	header('Content-Type: application/json');
	echo json_encode(['success' => $successful, 'errors' => $errors]);
	exit;
	}

	// Load config file
	$config = include(__DIR__ . '/config.php');

	// Download from https://github.com/google/recaptcha
	require(__DIR__ . '/recaptcha/src/autoload.php');
	$recaptcha = new \ReCaptcha\ReCaptcha($config['recaptcha']['privatekey']);

	$valid = true;
	if (isset($_POST['g-recaptcha-response'])) {
	$resp = $recaptcha->verify($_POST['g-recaptcha-response'], $_SERVER['REMOTE_ADDR']);

	if (!$resp->isSuccess()) {
	$valid = false;
	$errors['captcha'] = "You must solve the CAPTCHA.";
	}

	$contact = filter_input_array(INPUT_POST, array(
	'name' => FILTER_SANITIZE_STRING,
	'email' => FILTER_SANITIZE_STRING,
	'message' => FILTER_SANITIZE_STRING,
	), true);
	if (empty($contact['name'])) {
	$valid = false;
	$errors['name'] = "You must enter your name.";
	}
	if (empty($contact['email'])) {
	$valid = false;
	$errors['email'] = "You must enter your email address.";
	} elseif (!filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL)) {
	$valid = false;
	$errors['email'] = "You must enter a valid email address.";
	}
	if (empty($contact['message'])) {
	$valid = false;
	$errors['message'] = "You must enter a message.";
	}

	if ($valid) {
	// The email address the email will be sent to
	$to = $config['contact']['to'];
	// Set the from address for the email
	$from = $config['contact']['from'];
	// The email subject
	$subject = "Contact Form Submission";
	// Set the from and reply-to address for the email
	$headers = "From: " . $from . "\r\n"
	. "Reply-To: " . $contact['email'] . "\r\n"
	. "X-Mailer: PHP/" . phpversion();
	// Build the body of the email
	$mailbody = "The contact form has been filled out.\n\n"
	. "Name: " . $contact['name'] . "\n"
	. "Email: " . $contact['email'] . "\n"
	. "Message:\n" . $contact['message'];
	// Send the email
	mail($to, $subject, $mailbody, $headers);
	// Go to the thank you page
	sendJsonResponse(true);
	} else {
	sendJsonResponse(false, $errors);
	}
	}