Require phone number for Restaurant Reservations

required-phone-for-rtb.php

<?php
/**
 * Plugin Name: Required Phone Number addon for Restaurant Reservations
 * Plugin URI: http://themeofthecrop.com
 * Description: Modify the Restaurant Reservations plugin to require the phone number.
 * Version: 1.0
 * Author: Theme of the Crop
 * Author URI: http://themeofthecrop.com
 * License:     GNU General Public License v2.0 or later
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 * Requires at least: 3.8
 * Tested up to: 3.9.1
 *
 * Text Domain: rtbdomain
 * Domain Path: /languages/
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU
 * General Public License as published by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write
 * to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */
if ( ! defined( 'ABSPATH' ) )
	exit;

if ( !class_exists( 'rpnfrrInit' ) ) {
class rpnfrrInit {

	/**
	 * Initialize the plugin and register hooks
	 */
	public function __construct() {

		// Require a phone number as well
		add_action( 'rtb_validate_booking_submission', array( $this, 'validate_phone_number' ) );

	}

	/**
	 * Require a phone number
	 * @since 0.0.1
	 */
	public function validate_phone_number( $booking ) {

		if ( empty( $booking->phone ) ) {
			$booking->validation_errors[] = array(
				'field'			=> 'phone',
				'post_variable'	=> $_POST['rtb-phone'],
				'message'	=> __( 'Please enter a phone number where we can reach you.', RTB_TEXTDOMAIN ),
			);
		}

	}

}
} // endif;

new rpnfrrInit();