ms_load_current_site_and_network( string $domain, string $path, bool $subdomain = false ): bool|string

297function ms_load_current_site_and_network( $domain, $path, $subdomain = false ) {298	global $current_site, $current_blog;299 300	// If the network is defined in wp-config.php, we can simply use that.301	if ( defined( 'DOMAIN_CURRENT_SITE' ) && defined( 'PATH_CURRENT_SITE' ) ) {302		$current_site         = new stdClass();303		$current_site->id     = defined( 'SITE_ID_CURRENT_SITE' ) ? SITE_ID_CURRENT_SITE : 1;304		$current_site->domain = DOMAIN_CURRENT_SITE;305		$current_site->path   = PATH_CURRENT_SITE;306		if ( defined( 'BLOG_ID_CURRENT_SITE' ) ) {307			$current_site->blog_id = BLOG_ID_CURRENT_SITE;308		} elseif ( defined( 'BLOGID_CURRENT_SITE' ) ) { // Deprecated.309			$current_site->blog_id = BLOGID_CURRENT_SITE;310		}311 312		if ( 0 === strcasecmp( $current_site->domain, $domain ) && 0 === strcasecmp( $current_site->path, $path ) ) {313			$current_blog = get_site_by_path( $domain, $path );314		} elseif ( '/' !== $current_site->path && 0 === strcasecmp( $current_site->domain, $domain ) && 0 === stripos( $path, $current_site->path ) ) {315			/*316			 * If the current network has a path and also matches the domain and path of the request,317			 * we need to look for a site using the first path segment following the network's path.318			 */319			$current_blog = get_site_by_path( $domain, $path, 1 + count( explode( '/', trim( $current_site->path, '/' ) ) ) );320		} else {321			// Otherwise, use the first path segment (as usual).322			$current_blog = get_site_by_path( $domain, $path, 1 );323		}324	} elseif ( ! $subdomain ) {325		/*326		 * A "subdomain" installation can be re-interpreted to mean "can support any domain".327		 * If we're not dealing with one of these installations, then the important part is determining328		 * the network first, because we need the network's path to identify any sites.329		 */330		$current_site = wp_cache_get( 'current_network', 'site-options' );331		if ( ! $current_site ) {332			// Are there even two networks installed?333			$networks = get_networks( array( 'number' => 2 ) );334			if ( count( $networks ) === 1 ) {335				$current_site = array_shift( $networks );336				wp_cache_add( 'current_network', $current_site, 'site-options' );337			} elseif ( empty( $networks ) ) {338				// A network not found hook should fire here.339				return false;340			}341		}342 343		if ( empty( $current_site ) ) {344			$current_site = WP_Network::get_by_path( $domain, $path, 1 );345		}346 347		if ( empty( $current_site ) ) {348			/**349			 * Fires when a network cannot be found based on the requested domain and path.350			 *351			 * At the time of this action, the only recourse is to redirect somewhere352			 * and exit. If you want to declare a particular network, do so earlier.353			 *354			 * @since 4.4.0355			 *356			 * @param string $domain       The domain used to search for a network.357			 * @param string $path         The path used to search for a path.358			 */359			do_action( 'ms_network_not_found', $domain, $path );360 361			return false;362		} elseif ( $path === $current_site->path ) {363			$current_blog = get_site_by_path( $domain, $path );364		} else {365			// Search the network path + one more path segment (on top of the network path).366			$current_blog = get_site_by_path( $domain, $path, substr_count( $current_site->path, '/' ) );367		}368	} else {369		// Find the site by the domain and at most the first path segment.370		$current_blog = get_site_by_path( $domain, $path, 1 );371		if ( $current_blog ) {372			$current_site = WP_Network::get_instance( $current_blog->site_id ? $current_blog->site_id : 1 );373		} else {374			// If you don't have a site with the same domain/path as a network, you're pretty screwed, but:375			$current_site = WP_Network::get_by_path( $domain, $path, 1 );376		}
When	Instructions	Calls it makes
always	24–26	`wp_cache_get(), do_action()`
`empty($networks)`	24–26	`wp_cache_get(), get_networks()`
`empty($current_site)`	30–40	`get_site_by_path(), ::WP_Network(), do_action()`
`empty($current_site)`	30–32	`wp_cache_get(), ::WP_Network(), do_action()`
`!empty($current_site) && !empty($current_blog)`	31–41	`get_site_by_path(), ::WP_Network()`
`!empty($networks)`	33–35	`wp_cache_get(), get_networks(), do_action()`
`!empty($current_site)`	34–51	`get_site_by_path(), ::WP_Network(), wp_installing()`
`$path === false`	36–43	`wp_cache_get(), get_site_by_path(), do_action()`
`!empty($current_site) && $path === false && !empty($current_blog)`	37–44	`wp_cache_get(), get_site_by_path()`
`!empty($current_blog)`	38–48	`get_site_by_path(), ::WP_Network(), get_main_site_id()`
`!empty($networks) && empty($current_site)`	39–41	`wp_cache_get(), get_networks(), ::WP_Network(), do_action()`
`!empty($current_site) && $path === false`	40–54	`wp_cache_get(), get_site_by_path(), wp_installing()`
PHP	Compiled	Executed	Branches	Notes
8.6-dev	271	24–114	32
8.5	271	24–114	32
8.4	271	24–114	32	6 fewer instructions than PHP 8.3
8.3	277	24–115	32
8.2	277	24–115	32
8.1	277	24–115	32	2 fewer instructions than PHP 7.4
7.4	279	24–115	32