[site-reviews] get the email value from an URL parameter

/**
 * @param array $fields
 * @param \GeminiLabs\SiteReviews\Arguments $args
 * @return array
 */
add_filter('site-reviews/review-form/fields', function ($fields, $args) {
    $email = filter_input(INPUT_GET, 'email', FILTER_VALIDATE_EMAIL);
    if (!empty($email)) {
        // Set the input type of the email field to "hidden"
        if (false !== array_search('email', $args->hide)) {
            $args->set('hide', array_diff($args->hide, ['email']));
            $fields['email']['placeholder'] = '';
            $fields['email']['type'] = 'hidden';
        }
        // Set the value of the email field
        $fields['email']['value'] = $email;
    }
    return $fields;
}, 10, 2);