The functions below can be used to get the root domain of a WordPress site. If the site is a multisite network and you’re on http://www.site1.example.com/page-1/, calling km_get_root_domain() would return example.com for instance. It also works on single-site WP installations.
| <?php | |
| /** | |
| * Get the root domain of the site/network. | |
| * | |
| * @return string|bool The root domain or false on failure. | |
| */ | |
| function km_get_root_domain() { | |
| $url_parts = parse_url( km_get_main_site_url() ); | |
| if ( $url_parts && isset( $url_parts['host'] ) ) { | |
| return $url_parts['host']; | |
| } | |
| return false; | |
| } | |
| /* | |
| * Get the home URL of the main site. | |
| * | |
| * @return string The home URL of the main site. | |
| */ | |
| function km_get_main_site_url() { | |
| // This is the current network's information; 'site' is old terminology. | |
| global $current_site; | |
| if ( is_multisite() && $current_site ) { | |
| $main_site_blog_id = $current_site->blog_id; | |
| return get_home_url( $main_site_blog_id ); | |
| } | |
| return home_url(); | |
| } |
Written by Kellen Mace, who lives in Rochester Hills, MI and builds cool stuff on the web. About Kellen // Follow him on Twitter →