How to Build a Hotel Booking Website Using Meta Box (P3) - functions.php

function.php

if ( ! get_option( 'rwmb_bookings' ) ) {

	add_option( 'rwmb_bookings', array() );

}

add_action( 'rwmb_booking-fields_after_save_post', 'update_bookings_date' );

function update_bookings_date( $post_id ) {
    $bookings = get_post_meta( $post_id, 'group_booking', true );
    if ( empty( $bookings ) || ! is_array( $bookings ) ) {
		return;
	}

    $option = get_option( 'rwmb_bookings' );

	foreach ( $bookings as $key => $booking ) {
		$room = $booking['room'];

		$begin = new DateTime( $booking['check_in'] );
		$end = new DateTime( $booking['check_out'] );

		$interval = new DateInterval('P1D'); 
		$daterange = new DatePeriod($begin, $interval ,$end);
		$dates_booking = array(); 
		foreach($daterange as $date){
		    array_push($dates_booking, $date->format("Y-m-d"));
		}

		$option[$room][$post_id][$key] = $dates_booking;
	}

	update_option('rwmb_bookings', $option);
}


function dates_disable($room_id){
	$bookings = get_option('rwmb_bookings')[$room_id];
	if (empty($bookings) && !is_array($bookings)) return;
	$dates = array();
	$disable = array();
	foreach ($bookings as $booking) {
		foreach ($booking as $value) {
			foreach ($value as $k ) {
				array_push($dates, $k);
			}
		}
	}
	$dates = array_count_values($dates);
	$quantity = rwmb_meta( 'quantity', $room_id);
	foreach ($dates as $key => $date) {
		if ($date >= $quantity) {
			array_push($disable, $key);
		}
	}
	return $disable;
}

function enqueue_script() {
  	if (is_singular('room')) { 
		wp_enqueue_script('custom-script', get_template_directory_uri().'/js/custom.js', array( 'jquery' ));
		wp_localize_script( 'custom-script', 'ajaxurl', admin_url('admin-ajax.php'));
		wp_localize_script( 'custom-script', 'disable_dates', json_encode(dates_disable(get_the_ID())));
  	}
}
add_action( 'wp_enqueue_scripts', 'enqueue_script');


/**
 * Remove expired date in variable option
 */
function array_filter_recursive ($data) {
    $original = $data;
    $data = array_filter($data);
    $data = array_map(function ($e) {
        return is_array($e) ? array_filter_recursive($e) : $e;
    }, $data);
    return $original === $data ? $data : array_filter_recursive($data);
}

function optimal_bookings_option() {
	$bookings = get_option('rwmb_bookings');
	$today = date("Y-m-d");
	foreach ($bookings as $key_1 => $bk_1) {
		foreach ($bk_1 as $key_2 => $bk_2) {
			foreach ($bk_2 as $key_3 => $bk_3 ) {
				foreach ($bk_3 as $key_4 => $bk_4) {
					if ($bk_4 < $today) {
						unset($bookings[$key_1][$key_2][$key_3][$key_4]);
					}
				}
				
			}
		}
	}
	$bookings = array_filter_recursive($bookings);
	update_option('rwmb_bookings', $bookings);
}

add_action( 'init', 'optimal_bookings_option' );

add_filter( 'rwmb_frontend_validate', function( $validate, $config ) {
    if ( 'booking-fields' !== $config['id'] ) {
        return $validate;
    }
    $disable_dates = dates_disable(get_the_ID());
	$checkin =  date("Y-m-d", strtotime($_POST['group_booking_check_in']));
	$checkout =  date("Y-m-d", strtotime($_POST['group_booking_check_out']));

    if ( false !== array_search($checkin, $disable_dates)) {
        $validate = false;
    } else {
    	update_post_meta($config['post_id'], 'group_booking_room', get_the_ID());
    }

    return $validate;
}, 10, 2 );