Email PHP and jQuery Ajax Scripts for Webflow HTML Export with Google Recaptcha

email.js

(function ($) {
    var Webflow = window.Webflow || [];
    Webflow.push(function () {

        // === Custom Form Handling ===

        // unbind webflow form handling
        $(document).off('submit');

        // new form handling
        $(document).on('submit', '#wf-form-Contact-Form', function (e) {
            e.preventDefault();
            var $form = $(this);
            var $submit = $form.find('input[type="submit"]');
            var submitVal = $submit.val();
            var submitWait = $submit.data('wait');
            $submit.val(submitWait).prop('disabled', true);
            var $successMessage = $('.success-message').hide();
            var $errorMessage = $('.error-message').hide();
            var url = $form.attr('action');

            $.ajax({
                type: "POST",
                url: url,
                data: $form.serialize(), // serializes the form's elements.
                success: function (data) {
                    console.log(data); // show response from the php script.
                    $form.hide();
                    $successMessage.show();
                },
                error: function () {
                    $errorMessage.show();
                },
                complete: function () {
                    $submit.val(submitVal).prop('disabled', false);
                }
            });
        });
    });
})(jQuery);

email.php

<?php
//Import PHPMailer classes into the global namespace
//These must be at the top of your script, not inside a function
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

//Load
require 'PHPMailer/src/Exception.php';
require 'PHPMailer/src/PHPMailer.php';
require 'PHPMailer/src/SMTP.php';

/**
 * @source https://gist.github.com/james2doyle/33794328675a6c88edd6
 */
function json_response($code = 200, $message = null)
{
    // clear the old headers
    header_remove();
    // set the actual code
    http_response_code($code);
    // set the header to make sure cache is forced
    header("Cache-Control: no-transform,public,max-age=300,s-maxage=900");
    // treat this as json
    header('Content-Type: application/json; charset=utf-8');
    $status = array(
        200 => '200 OK',
        400 => '400 Bad Request',
        422 => 'Unprocessable Entity',
        500 => '500 Internal Server Error'
    );
    // ok, validation error, or failure
    header('Status: ' . $status[$code]);
    // return the encoded json
    return json_encode(array(
        'status' => $code < 300, // success or not?
        'message' => $message
    ));
}

/**
 * @source https://gist.github.com/jonathanstark/dfb30bdfb522318fc819
 */
function verify_recaptcha()
{
    // for Cloudflare
    if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
        $_SERVER['REMOTE_ADDR'] = $_SERVER["HTTP_CF_CONNECTING_IP"];
    }

    $post_data = http_build_query(
        array(
            'secret' => RECAPTCHA_SECRET,
            'response' => $_POST['g-recaptcha-response'],
            'remoteip' => $_SERVER['REMOTE_ADDR']
        )
    );
    $opts = array(
        'http' =>
        array(
            'method'  => 'POST',
            'header'  => 'Content-type: application/x-www-form-urlencoded',
            'content' => $post_data
        )
    );
    $context  = stream_context_create($opts);
    $response = file_get_contents('https://www.google.com/recaptcha/api/siteverify', false, $context);
    $result = json_decode($response);
    return $result->success;
}

if (!verify_recaptcha()) {
    echo json_response(422);
    die;
}

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    echo json_response(422);
    die;
}

$first_name = trim($_POST['First-Name']);
$last_name = trim($_POST['Last-Name']);
$email = trim($_POST['Email']);
$phone = $_POST['Contact-Phone-Number'];
$message = trim($_POST['Message']);
$empty = 'Unspecified';

$rows = [
    'Name' => "{$first_name} {$last_name}",
    'Email' => $email,
    'Phone' => empty($phone) ? $empty : $phone,
    'Message' => empty($message) ? $empty : $message,
];

$message = [];
$message[] = '<table>';
$message[] = '<tbody>';
foreach ($rows as $label => $value) {
    $message[] = '<tr>';
    $message[] = "<th align=\"left\" style=\"padding: 8px;\">{$label}</th>";
    $message[] = "<td align=\"left\" style=\"padding: 8px;\">:</td>";
    $message[] = "<td align=\"left\" style=\"padding: 8px;\">{$value}</td>";
    $message[] = '</tr>';
}
$message[] = '</tbody>';
$message[] = '</table>';

$message = implode("", $message);

$subject = "{$first_name} {$last_name} isimli göndericiden mesaj var";

if (in_array('', [$first_name, $last_name, $email]) || !filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo json_response(422);
    die;
}

//Instantiation and passing `true` enables exceptions
$mail = new PHPMailer(true);

try {

    //Server settings
    // $mail->SMTPDebug = SMTP::DEBUG_SERVER;                      //Enable verbose debug output
    $mail->isSMTP();                                            //Send using SMTP
    $mail->Host       = SMTP_HOST;                     //Set the SMTP server to send through
    $mail->SMTPAuth   = SMTP_AUTH;                                   //Enable SMTP authentication
    $mail->Username   = SMTP_USERNAME;                     //SMTP username
    $mail->Password   = SMTP_PASSWORD;                               //SMTP password
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_SMTPS;         //Enable TLS encryption; `PHPMailer::ENCRYPTION_SMTPS` encouraged
    $mail->Port       = SMTP_PORT;                                    //TCP port to connect to, use 465 for `PHPMailer::ENCRYPTION_SMTPS` above

    //Recipients
    $mail->setFrom(SMTP_USERNAME, FROM_NAME);
    $mail->addAddress(TO, NAME);     //Add a recipient
    // $mail->addAddress('ellen@example.com');               //Name is optional
    $mail->addReplyTo($email);
    // $mail->addCC('cc@example.com');
    // $mail->addBCC('bcc@example.com');

    //Attachments
    // $mail->addAttachment('/var/tmp/file.tar.gz');         //Add attachments
    // $mail->addAttachment('/tmp/image.jpg', 'new.jpg');    //Optional name

    //Content
    $mail->isHTML(true);                                  //Set email format to HTML
    $mail->Subject = $subject;
    $mail->Body    = $message;
    $mail->AltBody = strip_tags($message);

    $mail->send();

    echo json_response(200);
} catch (Exception $e) {
    echo json_response(400, $mail->ErrorInfo);
}
die;