- global $wpdb;
-
- $domains = $exact_domains = array( $domain );
- $pieces = explode( '.', $domain );
-
- /*
- * It's possible one domain to search is 'com', but it might as well
- * be 'localhost' or some other locally mapped domain.
- */
- while ( array_shift( $pieces ) ) {
- if ( $pieces ) {
- $domains[] = implode( '.', $pieces );
- }
- }
-
- /*
- * If we've gotten to this function during normal execution, there is
- * more than one network installed. At this point, who knows how many
- * we have. Attempt to optimize for the situation where networks are
- * only domains, thus meaning paths never need to be considered.
- *
- * This is a very basic optimization; anything further could have drawbacks
- * depending on the setup, so this is best done per-install.
- */
- $using_paths = true;
- if ( wp_using_ext_object_cache() ) {
- $using_paths = wp_cache_get( 'networks_have_paths', 'site-options' );
- if ( false === $using_paths ) {
- $using_paths = (bool) $wpdb->get_var( "SELECT id FROM $wpdb->site WHERE path <> '/' LIMIT 1" );
- wp_cache_add( 'networks_have_paths', (int) $using_paths, 'site-options' );
- }
- }
-
- $paths = array();
- if ( $using_paths ) {
- $path_segments = array_filter( explode( '/', trim( $path, "/" ) ) );
-
- /**
- * Filter the number of path segments to consider when searching for a site.
- *
- * @since 3.9.0
- *
- * @param int|null $segments The number of path segments to consider. WordPress by default looks at
- * one path segment. The function default of null only makes sense when you
- * know the requested path should match a network.
- * @param string $domain The requested domain.
- * @param string $path The requested path, in full.
- */
- $segments = apply_filters( 'network_by_path_segments_count', $segments, $domain, $path );
-
- if ( null !== $segments && count($path_segments ) > $segments ) {
- $path_segments = array_slice( $path_segments, 0, $segments );
- }
-
- while ( count( $path_segments ) ) {
- $paths[] = '/' . implode( '/', $path_segments ) . '/';
- array_pop( $path_segments );
- }
-
- $paths[] = '/';
- }
-
- /**
- * Determine a network by its domain and path.
- *
- * This allows one to short-circuit the default logic, perhaps by
- * replacing it with a routine that is more optimal for your setup.
- *
- * Return null to avoid the short-circuit. Return false if no network
- * can be found at the requested domain and path. Otherwise, return
- * an object from wp_get_network().
- *
- * @since 3.9.0
- *
- * @param null|bool|object $network Network value to return by path.
- * @param string $domain The requested domain.
- * @param string $path The requested path, in full.
- * @param int|null $segments The suggested number of paths to consult.
- * Default null, meaning the entire path was to be consulted.
- * @param array $paths The paths to search for, based on $path and $segments.
- */
- $pre = apply_filters( 'pre_get_network_by_path', null, $domain, $path, $segments, $paths );
- if ( null !== $pre ) {
- return $pre;
- }
-
- // @todo Consider additional optimization routes, perhaps as an opt-in for plugins.
- // We already have paths covered. What about how far domains should be drilled down (including www)?
-
- $search_domains = "'" . implode( "', '", $wpdb->_escape( $domains ) ) . "'";
-
- if ( ! $using_paths ) {
- $network = $wpdb->get_row( "SELECT id, domain, path FROM $wpdb->site
- WHERE domain IN ($search_domains) ORDER BY CHAR_LENGTH(domain) DESC LIMIT 1" );
- if ( $network ) {
- return wp_get_network( $network );
- }
- return false;
-
- } else {
- $search_paths = "'" . implode( "', '", $wpdb->_escape( $paths ) ) . "'";
- $networks = $wpdb->get_results( "SELECT id, domain, path FROM $wpdb->site
- WHERE domain IN ($search_domains) AND path IN ($search_paths)
- ORDER BY CHAR_LENGTH(domain) DESC, CHAR_LENGTH(path) DESC" );
- }
-
- /*
- * Domains are sorted by length of domain, then by length of path.
- * The domain must match for the path to be considered. Otherwise,
- * a network with the path of / will suffice.
- */
- $found = false;
- foreach ( $networks as $network ) {
- if ( $network->domain === $domain || "www.$network->domain" === $domain ) {
- if ( in_array( $network->path, $paths, true ) ) {
- $found = true;
- break;
- }
- }
- if ( $network->path === '/' ) {
- $found = true;
- break;
- }
- }
-
- if ( $found ) {
- return wp_get_network( $network );
- }
-
- return false;