<?php
// index.php

require_once '/path/to/contact-form/vendor/autoload.php';

$cf = new \Ttskch\ContactForm\ContactForm();

// validation targets ("required" and "email" are supported)
$requiredKeys = ['Name', 'Email'];
$emailKeys = ['Email'];

// after posted, validate csrf and submissions and redirect to next page
$cf->validateAndRedirectAfterSelfPosted('./confirm.php', $requiredKeys, $emailKeys);
?>

<!-- post to self -->
<form action="" method="post">
    
    <!-- put hidden input tag for csrf token -->
    <?= $cf->csrfHiddenInput(); ?>

    <!-- text field with submitted value if exists -->
    <input type="text" name="Name" value="<?= $cf->present('Name'); ?>" required autofocus>
    <!-- show error if exists -->
    <p><?= $cf->presentError('Name'); ?></p>
    
    <!-- text field with submitted value if exists -->
    <input type="email" name="Email" value="<?= $cf->present('Email'); ?>" required>
    <!-- show error if exists -->
    <p><?= $cf->presentError('Email'); ?></p>
    
    <!-- selector field with selection submitted or default option -->
    <select class="form-control" name="Gender">
        <option value="Male" <?= $cf->presentSelected('Gender', 'Male', $default = true); ?>>Male</option>
        <option value="Female" <?= $cf->presentSelected('Gender', 'Female'); ?>>Female</option>
        <option value="Other" <?= $cf->presentSelected('Gender', 'Other'); ?>>Other</option>
    </select>

    <button type="submit">Confirm</button>
</form>

<?php
// confirm.php

require_once '/path/to/contact-form/vendor/autoload.php';

$cf = new \Ttskch\ContactForm\ContactForm();

// redirect to top page if requested without submissions
$cf->rejectAccessWithoutSubmissions('./index.php');

// after posted, validate csrf and redirect to next page
$cf->validateAndRedirectAfterSelfPosted('./thanks.php');
?>

<!-- post to self -->
<form action="" method="post">

    <!-- put hidden input tag for csrf token -->
    <?= $cf->csrfHiddenInput(); ?>
    
    <!-- show submitted values -->
    <p><?= $cf->present('Name'); ?></p>
    <p><?= $cf->present('Email'); ?></p>
    <p><?= $cf->present('Gender'); ?></p>

    <button type="submit">Send</button>
    
    <!-- can back to index.php and re-edit inputs -->
    <a href="javascript:history.back();">Back</a>

</form>

<?php
// thanks.php

require_once '/path/to/contact-form/vendor/autoload.php';

$cf = new \Ttskch\ContactForm\ContactForm();

// redirect to top page if requested without submissions
$cf->rejectAccessWithoutSubmissions('./index.php');

$template = <<<EOT
----------------------------------------------------------------------
Name: %s
----------------------------------------------------------------------
Email: %s
----------------------------------------------------------------------
Gender: %s
----------------------------------------------------------------------
EOT;

$body = vsprintf($template, [
    $cf->present('Name', false),
    $cf->present('Email', false),
    $cf->present('Gender', false),
]);

$cf->sendEmail(
    'you@email.com',  // to
    'from@email.com', // from
    'Your Name',      // from name
    'Got inquiry',    // subject
    $body             // body
);

// clear submissions after sending email
// by this, if users reload thanks.php after sending email they will be redirected to index.php 
$cf->clearSubmissions();
?>

<p>Form is successfully submitted!</p>