Defines Multisite cookie constants.

function ms_cookie_constants() {
	$current_network = get_network();

	/**
	 * @since 1.2.0
	 */
	if ( ! defined( 'COOKIEPATH' ) ) {
		define( 'COOKIEPATH', $current_network->path );
	}

	/**
	 * @since 1.5.0
	 */
	if ( ! defined( 'SITECOOKIEPATH' ) ) {
		define( 'SITECOOKIEPATH', $current_network->path );
	}

	/**
	 * @since 2.6.0
	 */
	if ( ! defined( 'ADMIN_COOKIE_PATH' ) ) {
		$site_path = parse_url( get_option( 'siteurl' ), PHP_URL_PATH );
		if ( ! is_subdomain_install() || is_string( $site_path ) && trim( $site_path, '/' ) ) {
			define( 'ADMIN_COOKIE_PATH', SITECOOKIEPATH );
		} else {
			define( 'ADMIN_COOKIE_PATH', SITECOOKIEPATH . 'wp-admin' );
		}
	}

	/**
	 * @since 2.0.0
	 */
	if ( ! defined( 'COOKIE_DOMAIN' ) && is_subdomain_install() ) {
		if ( ! empty( $current_network->cookie_domain ) ) {
			define( 'COOKIE_DOMAIN', '.' . $current_network->cookie_domain );
		} else {
			define( 'COOKIE_DOMAIN', '.' . $current_network->domain );
		}
	}
}