Php Form Builder - Bootstrap 4 Booking Form

<?php
use phpformbuilder\Form;
use phpformbuilder\Validator\Validator;

/* =============================================
    start session and include form class
============================================= */

session_start();
include_once rtrim($_SERVER['DOCUMENT_ROOT'], DIRECTORY_SEPARATOR) . '/phpformbuilder/Form.php';

/* =============================================
    validation if posted
============================================= */

if ($_SERVER["REQUEST_METHOD"] == "POST" && Form::testToken('booking-form') === true) {
    // create validator & auto-validate required fields
    $validator = Form::validate('booking-form');

    // additional validation
    $validator->email()->validate('user-email');

    // check for errors
    if ($validator->hasErrors()) {
        $_SESSION['errors']['booking-form'] = $validator->getAllErrors();
    } else {
        $email_config = array(
            'sender_email'    => 'contact@phpformbuilder.pro',
            'sender_name'     => 'Php Form Builder',
            'recipient_email' => addslashes($_POST['user-email']),
            'subject'         => 'Php Form Builder - Booking Form',
            'filter_values'   => 'booking-form, date_submit, time_submit',
            'debug' => true
        );
        $sent_message = Form::sendMail($email_config);
        Form::clear('booking-form');
    }
}

/* ==================================================
    The Form
================================================== */

$form = new Form('booking-form', 'horizontal', 'novalidate');
// $form->setMode('development');
$form->startFieldset('Please fill the form below');
$form->setCols(4, 4);
$form->groupInputs('first-name', 'last-name');
$form->addHelper('First name', 'first-name');
$form->addInput('text', 'first-name', '', 'Full Name : ', 'required');
$form->setCols(0, 4);
$form->addHelper('Last name', 'last-name');
$form->addInput('text', 'last-name', '', '', 'required');
$form->setCols(4, 8);
$form->addInput('email', 'user-email', '', 'E-Mail : ', 'required');
$form->addHelper('Enter a valid phone number', 'phone-number');
$form->addInput('tel', 'user-phone', '', 'Phone Number : ', 'data-intphone=true, data-fv-intphonenumber=true, required');
$form->addInput('number', 'number-of-guests', '', 'Number of Guests: : ', 'data-fv-integer, required');
$form->setCols(4, 6);
$form->groupInputs('date', 'time');
$form->addPlugin('pickadate', '#date');
$form->addHelper('Date', 'date');
$form->addInput('text', 'date', '', 'Date / Time: ', 'data-min=' . date('Y-m-d') . ', data-select-years=true, data-select-months=true, required');
$form->setCols(0, 2);
$form->addPlugin('pickadate', '#time', 'pickatime');
$form->addHelper('Time', 'time');
$form->addInput('text', 'time', '', '', 'data-interval=30, data-min=08\,30, data-max=17\,00, required');
$form->setCols(4, 8);
$form->addOption('reservation-type', 'Dinner', 'Dinner', '', 'data-left=Hello world!');
$form->addOption('reservation-type', 'Birthday/ Anniversary', 'Birthday/ Anniversary', '', 'data-icon=fa fa-birthday-cake');
$form->addOption('reservation-type', 'Nightlife', 'Nightlife', '', 'data-icon=fa fa-moon-o');
$form->addOption('reservation-type', 'Private', 'Private', '', 'data-icon=fa fa-user-secret');
$form->addOption('reservation-type', 'Wedding', 'Wedding', '', 'data-icon=fa fa-heart');
$form->addOption('reservation-type', 'Corporate', 'Corporate', '', 'data-icon=fa fa-briefcase');
$form->addOption('reservation-type', 'Other', 'Other', '', 'data-icon=fa fa-star');
$form->addSelect('reservation-type', 'Reservation Type', 'class=select2, required');
$form->startDependentFields('reservation-type', 'Other');
$form->addInput('text', 'reservation-type-other', '', '', 'placeholder=Please tell more ..., required');
$form->endDependentFields();
$form->addTextarea('special-request', '', 'Any Special Request ? ');
$form->centerButtons(true);
$form->addBtn('submit', 'submit-btn', 1, 'Submit <i class="fa fa-arrow-right fa-fw"></i>', 'class=btn btn-success ladda-button, data-style=zoom-in');
$form->endFieldset();

// jQuery validation
$form->addPlugin('formvalidation', '#booking-form');
?>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <title>Bootstrap 4 Booking Form - How to create PHP forms easily</title>
    <meta name="description" content="Bootstrap 4 Form Generator - how to create a Booking Form with Php Form Builder Class">
    <link rel="canonical" href="https://www.phpformbuilder.pro/templates/bootstrap-4-forms/booking-form.php" />

    <!-- Bootstrap 4 CSS -->

    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

    <!-- Font awesome icons -->

    <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.2/css/all.css" integrity="sha384-oS3vJWv+0UjzBfQzYUhtDYW+Pj2yciDJxpsK1OYPAYjqT085Qq/1cq5FLXAZQ7Ay" crossorigin="anonymous">
    <?php $form->printIncludes('css'); ?>
</head>

<body>
    <h1 class="text-center">Php Form Builder - Bootstrap 4 Booking Form</h1>
    <div class="container">
        <div class="row justify-content-center">
            <div class="col-md-11 col-lg-10">
                <?php
            if (isset($sent_message)) {
                echo $sent_message;
            }
            $form->render();
            ?>
            </div>
        </div>
    </div>

    <!-- jQuery -->

    <script src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>

    <!-- Bootstrap 4 JavaScript -->

    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
    <?php
        $form->printIncludes('js');
        $form->printJsCode();
    ?>
</body>

</html>