is_multisite() WordPress Function
The is_multisite() function is used to check if a WordPress site is running as a multisite network. If the site is running as a multisite network, this function will return true. Otherwise, it will return false.
is_multisite() #
If Multisite is enabled.
Return
(bool) True if Multisite is enabled, false otherwise.
More Information
Usage
if ( is_multisite() ) { echo 'Multisite is enabled'; }
Source
File: wp-includes/load.php
function is_multisite() {
if ( defined( 'MULTISITE' ) ) {
return MULTISITE;
}
if ( defined( 'SUBDOMAIN_INSTALL' ) || defined( 'VHOST' ) || defined( 'SUNRISE' ) ) {
return true;
}
return false;
}
Expand full source codeCollapse full source codeView on TracView on GitHub
Related
Used By
| Used By | Description |
|---|---|
| wp-includes/user.php:wp_maybe_update_user_counts() | Updates the total count of users on the site if live user counting is enabled. |
| wp-includes/user.php:wp_update_user_counts() | Updates the total count of users on the site. |
| wp-includes/user.php:wp_is_large_user_count() | Determines whether the site has a large number of users. |
| wp-admin/includes/plugin.php:deactivated_plugins_notice() | Renders an admin notice when a plugin was deactivated during an update. |
| wp-includes/rest-api/endpoints/class-wp-rest-site-health-controller.php:WP_REST_Site_Health_Controller::register_routes() | Registers API routes. |
| wp-includes/rest-api/endpoints/class-wp-rest-application-passwords-controller.php:WP_REST_Application_Passwords_Controller::get_user() | Gets the requested user. |
| wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php:WP_REST_Plugins_Controller::plugin_status_permission_check() | Handle updating a plugin’s status. |
| wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php:WP_REST_Plugins_Controller::handle_plugin_status() | Handle updating a plugin’s status. |
| wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php:WP_REST_Plugins_Controller::get_item_schema() | Retrieves the plugin’s schema, conforming to JSON Schema. |
| wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php:WP_REST_Plugins_Controller::get_collection_params() | Retrieves the query params for the collections. |
| wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php:WP_REST_Plugins_Controller::check_read_permission() | Checks if the given plugin can be viewed by the current user. |
| wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php:WP_REST_Plugins_Controller::register_routes() | Registers the routes for the plugins controller. |
| wp-includes/capabilities.php:wp_maybe_grant_site_health_caps() | Filters the user capabilities to grant the ‘view_site_health_checks’ capabilities as necessary. |
| wp-includes/class-wp-recovery-mode.php:WP_Recovery_Mode::is_network_plugin() | Checks whether the given extension a network activated plugin. |
| wp-includes/class-wp-fatal-error-handler.php:WP_Fatal_Error_Handler::handle() | Runs the shutdown handler. |
| wp-admin/includes/class-wp-debug-data.php:WP_Debug_Data::debug_data() | Static function for generating site debug data when required. |
| wp-admin/includes/class-wp-site-health.php:WP_Site_Health::get_test_plugin_version() | Test if plugins are outdated, or unnecessary. |
| wp-admin/includes/class-wp-site-health.php:WP_Site_Health::get_test_theme_version() | Test if themes are outdated, or unnecessary. |
| wp-admin/includes/class-wp-site-health-auto-updates.php:WP_Site_Health_Auto_Updates::test_wp_version_check_attached() | Check if updates are intercepted by a filter. |
| wp-admin/includes/ajax-actions.php:wp_ajax_health_check_get_sizes() | Ajax handler for site health check to get directories and database sizes. |
| wp-includes/functions.php:is_site_meta_supported() | Determines whether site meta is enabled. |
| wp-admin/includes/schema.php:populate_network_meta() | Creates WordPress network meta and sets the default values. |
| wp-includes/embed.php:get_oembed_response_data_for_url() | Retrieves the oEmbed response data for a given URL. |
| wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php:WP_REST_Attachments_Controller::check_upload_size() | Determine if uploaded file exceeds space quota on multisite. |
| wp-includes/class-wp-roles.php:WP_Roles::get_roles_data() | Gets the available roles data. |
| wp-includes/functions.php:get_main_site_id() | Gets the main site ID. |
| wp-includes/customize/class-wp-customize-themes-panel.php:WP_Customize_Themes_Panel::content_template() | An Underscore (JS) template for this panel’s content (but not its container). |
| wp-includes/customize/class-wp-customize-themes-section.php:WP_Customize_Themes_Section::render_template() | Render a themes section as a JS template. |
| wp-includes/option.php:delete_expired_transients() | Deletes all expired transients. |
| wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php:WP_REST_Users_Controller::get_user() | Get the user, if the ID is valid. |
| wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php:WP_REST_Users_Controller::check_role_update() | Determines if the current user is allowed to make the desired roles change. |
| wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php:WP_REST_Users_Controller::delete_item() | Deletes a single user. |
| wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php:WP_REST_Users_Controller::create_item() | Creates a single user. |
| wp-includes/option.php:register_initial_settings() | Registers default settings available in WordPress. |
| wp-includes/class-wp-theme.php:WP_Theme::network_enable_theme() | Enables a theme for all sites on the current network. |
| wp-includes/class-wp-theme.php:WP_Theme::network_disable_theme() | Disables a theme for all sites on the current network. |
| wp-includes/load.php:get_current_network_id() | Retrieves the current network ID. |
| wp-admin/includes/ajax-actions.php:wp_ajax_install_theme() | Ajax handler for installing a theme. |
| wp-admin/includes/ajax-actions.php:wp_ajax_install_plugin() | Ajax handler for installing a plugin. |
| wp-includes/general-template.php:has_custom_logo() | Determines whether the site has a custom logo. |
| wp-includes/general-template.php:get_custom_logo() | Returns a custom logo, linked to home unless the theme supports removing the link on the home page. |
| wp-includes/functions.php:_wp_upload_dir() | A non-filtered, non-cached version of wp_upload_dir() that doesn’t check the path. |
| wp-includes/rest-api.php:get_rest_url() | Retrieves the URL to a REST endpoint on a site. |
| wp-includes/user.php:wp_get_users_with_no_role() | Gets the user IDs of all users with no role on this site. |
| wp-includes/user.php:get_password_reset_key() | Creates, stores, then returns a password reset key for user. |
| wp-includes/option.php:update_network_option() | Updates the value of a network option that was already added. |
| wp-includes/option.php:add_network_option() | Adds a new network option. |
| wp-includes/option.php:delete_network_option() | Removes a network option by name. |
| wp-includes/option.php:get_network_option() | Retrieves a network’s option value based on the option name. |
| wp-includes/general-template.php:get_site_icon_url() | Returns the Site Icon URL. |
| wp-includes/functions.php:get_main_network_id() | Get the main network ID. |
| wp-includes/customize/class-wp-customize-theme-control.php:WP_Customize_Theme_Control::content_template() | Render a JS template for theme display. |
| wp-admin/includes/file.php:_wp_handle_upload() | Handles PHP uploads in WordPress. |
| wp-includes/user.php:retrieve_password() | Handles sending a password retrieval email to a user. |
| wp-admin/includes/network.php:network_step2() | Prints step 2 for Network installation process. |
| wp-admin/includes/class-plugin-upgrader.php:Plugin_Upgrader::bulk_upgrade() | Bulk upgrade several plugins at once. |
| wp-admin/includes/class-theme-upgrader.php:Theme_Upgrader::bulk_upgrade() | Upgrade several themes at once. |
| wp-admin/includes/theme.php:wp_prepare_themes_for_js() | Prepares themes for JavaScript. |
| wp-admin/includes/theme.php:delete_theme() | Removes a theme. |
| wp-admin/includes/theme.php:get_theme_update_available() | Retrieves the update link if there is a theme update available. |
| wp-admin/includes/class-wp-plugins-list-table.php:WP_Plugins_List_Table::get_bulk_actions() | |
| wp-admin/includes/class-wp-plugins-list-table.php:WP_Plugins_List_Table::display_rows() | |
| wp-admin/includes/class-wp-plugins-list-table.php:WP_Plugins_List_Table::single_row() | |
| wp-admin/includes/class-wp-plugins-list-table.php:WP_Plugins_List_Table::__construct() | Constructor. |
| wp-admin/includes/class-wp-plugins-list-table.php:WP_Plugins_List_Table::prepare_items() | |
| wp-admin/includes/class-wp-plugins-list-table.php:WP_Plugins_List_Table::no_items() | |
| wp-admin/includes/export.php:wxr_site_url() | Return the URL of the site |
| wp-admin/includes/deprecated.php:WP_User_Search::prepare_query() | Prepares the user search query (legacy). |
| wp-admin/includes/deprecated.php:get_author_user_ids() | Get all user IDs. |
| wp-admin/includes/deprecated.php:get_editable_user_ids() | Gets the IDs of any users who can edit posts. |
| wp-admin/includes/deprecated.php:get_nonauthor_user_ids() | Gets all users who are not authors. |
| wp-admin/includes/class-plugin-installer-skin.php:Plugin_Installer_Skin::after() | Action to perform following a plugin install. |
| wp-includes/capabilities.php:grant_super_admin() | Grants Super Admin privileges. |
| wp-includes/capabilities.php:revoke_super_admin() | Revokes Super Admin privileges. |
| wp-admin/includes/misc.php:save_mod_rewrite_rules() | Updates the htaccess file with the current rules if it is writable. |
| wp-admin/includes/misc.php:iis7_save_url_rewrite_rules() | Updates the IIS web.config file with the current rules if it is writable. |
| wp-admin/includes/misc.php:update_home_siteurl() | Flushes rewrite rules if siteurl, home or page_on_front changed. |
| wp-admin/includes/schema.php:populate_network() | Populate network settings. |
| wp-admin/includes/schema.php:wp_get_db_schema() | Retrieve the SQL for creating database tables. |
| wp-admin/includes/schema.php:populate_options() | Create WordPress options and set the default values. |
| wp-admin/includes/update.php:update_nag() | |
| wp-admin/includes/update.php:wp_plugin_update_row() | Displays update information for a plugin. |
| wp-admin/includes/dashboard.php:wp_dashboard_quota() | Displays file upload quota on dashboard. |
| wp-admin/includes/upgrade.php:pre_schema_upgrade() | Runs before the schema is upgraded. |
| wp-admin/includes/upgrade.php:wp_upgrade() | Runs WordPress Upgrade functions. |
| wp-admin/includes/upgrade.php:wp_install_defaults() | Creates the initial content for a newly-installed site. |
| wp-admin/includes/plugin.php:_get_dropins() | Returns drop-ins that WordPress uses. |
| wp-admin/includes/plugin.php:is_plugin_active_for_network() | Determines whether the plugin is active for the entire network. |
| wp-admin/includes/plugin.php:activate_plugin() | Attempts activation of plugin in a “sandbox” and redirects on success. |
| wp-admin/includes/plugin.php:deactivate_plugins() | Deactivates a single plugin or multiple plugins. |
| wp-admin/includes/plugin.php:validate_active_plugins() | Validates active plugins. |
| wp-admin/includes/user.php:edit_user() | Edit user settings based on contents of $_POST |
| wp-admin/includes/user.php:wp_delete_user() | Remove user and optionally reassign posts and links to another user. |
| wp-admin/includes/class-wp-themes-list-table.php:WP_Themes_List_Table::no_items() | |
| wp-admin/includes/class-wp-themes-list-table.php:WP_Themes_List_Table::display_rows() | |
| wp-admin/includes/class-wp-users-list-table.php:WP_Users_List_Table::single_row() | Generate HTML for a single row on the users.php admin panel. |
| wp-admin/includes/class-wp-users-list-table.php:WP_Users_List_Table::get_bulk_actions() | Retrieve an associative array of bulk actions available on this table. |
| wp-admin/includes/media.php:media_upload_form() | Outputs the legacy media upload form. |
| wp-admin/includes/ajax-actions.php:wp_ajax_query_themes() | Ajax handler for getting themes from themes_api(). |
| wp-admin/includes/ajax-actions.php:wp_ajax_autocomplete_user() | Ajax handler for user autocomplete. |
| wp-admin/includes/class-wp-importer.php:WP_Importer::set_blog() | |
| wp-includes/class-wp-user.php:WP_User::has_cap() | Returns whether the user has the specified capability. |
| wp-includes/class-wp-user.php:WP_User::get_role_caps() | Retrieves all of the capabilities of the user’s roles, and merges them with individual user capabilities. |
| wp-includes/capabilities.php:is_super_admin() | Determines whether user is a site admin. |
| wp-includes/capabilities.php:current_user_can_for_blog() | Returns whether the current user has the specified capability for a given site. |
| wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::enqueue_control_scripts() | Enqueues scripts for customize controls. |
| wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::register_controls() | Registers some default controls. |
| wp-includes/capabilities.php:map_meta_cap() | Maps a capability to the primitive capabilities required of the given user to satisfy the capability being checked. |
| wp-includes/class-wp-object-cache.php:WP_Object_Cache::__construct() | Sets up object properties; PHP 5 style constructor. |
| wp-includes/theme.php:wp_get_themes() | Returns an array of WP_Theme objects based on the arguments. |
| wp-includes/l10n.php:load_default_textdomain() | Load default translated strings based on locale. |
| wp-includes/l10n.php:get_locale() | Retrieves the current locale. |
| wp-includes/formatting.php:sanitize_option() | Sanitizes various option values based on the nature of the option. |
| wp-includes/general-template.php:wp_lostpassword_url() | Returns the URL that allows the user to retrieve the lost password |
| wp-includes/deprecated.php:wp_admin_bar_dashboard_view_site_menu() | Add the “Dashboard”/”Visit Site” menu. |
| wp-includes/class-wp-theme.php:WP_Theme::get_allowed_on_site() | Returns array of stylesheet names of themes allowed on the site. |
| wp-includes/class-wp-theme.php:WP_Theme::is_allowed() | Determines whether the theme is allowed (multisite only). |
| wp-includes/load.php:wp_not_installed() | Redirect to the installer if WordPress is not installed. |
| wp-includes/load.php:wp_get_active_and_valid_plugins() | Retrieve an array of active and valid plugin files. |
| wp-includes/functions.php:is_main_site() | Determine whether a site is the main site of the current network. |
| wp-includes/functions.php:is_main_network() | Determine whether a network is the main network of the Multisite installation. |
| wp-includes/functions.php:global_terms_enabled() | Determine whether global terms are enabled. |
| wp-includes/functions.php:wp_upload_bits() | Create a file in the upload folder with given content. |
| wp-includes/default-constants.php:wp_initial_constants() | Defines initial WordPress constants. |
| wp-includes/link-template.php:get_dashboard_url() | Retrieves the URL to the user’s dashboard. |
| wp-includes/link-template.php:network_site_url() | Retrieves the site URL for the current network. |
| wp-includes/link-template.php:network_home_url() | Retrieves the home URL for the current network. |
| wp-includes/link-template.php:network_admin_url() | Retrieves the URL to the admin area for the network. |
| wp-includes/link-template.php:get_home_url() | Retrieves the URL for a given site where the front end is accessible. |
| wp-includes/link-template.php:get_site_url() | Retrieves the URL for a given site where WordPress application files (e.g. wp-blog-header.php or the wp-admin/ folder) are accessible. |
| wp-includes/class-wp-admin-bar.php:WP_Admin_Bar::initialize() | Initializes the admin bar. |
| wp-includes/update.php:wp_version_check() | Check WordPress version against the newest version. |
| wp-includes/admin-bar.php:wp_admin_bar_wp_menu() | Adds the WordPress logo menu. |
| wp-includes/admin-bar.php:wp_admin_bar_my_account_item() | Adds the “My Account” item. |
| wp-includes/admin-bar.php:wp_admin_bar_my_account_menu() | Adds the “My Account” submenu items. |
| wp-includes/admin-bar.php:wp_admin_bar_site_menu() | Adds the “Site Name” menu. |
| wp-includes/admin-bar.php:wp_admin_bar_my_sites_menu() | Adds the “My Sites/[Site Name]” menu and all submenus. |
| wp-includes/admin-bar.php:wp_admin_bar_new_content_menu() | Adds “Add New” menu. |
| wp-includes/option.php:wp_load_alloptions() | Loads and caches all autoloaded options, if available or all options. |
| wp-includes/option.php:wp_load_core_site_options() | Loads and caches certain often requested site options if is_multisite() and a persistent cache is not being used. |
| wp-includes/class-wp-user-query.php:WP_User_Query::prepare_query() | Prepares the query variables. |
| wp-includes/user.php:wp_insert_user() | Inserts a user into the database. |
| wp-includes/user.php:get_blogs_of_user() | Gets the sites a user belongs to. |
| wp-includes/user.php:is_user_member_of_blog() | Finds out whether a user is a member of a given blog. |
| wp-includes/user.php:count_users() | Counts number of users who have each of the user roles. |
| wp-includes/user.php:wp_authenticate_spam_check() | For Multisite blogs, checks if the authenticated user has been marked as a spammer, or if the user’s primary blog has been marked as spam. |
| wp-includes/media.php:wp_plupload_default_settings() | Prints default Plupload arguments. |
| wp-includes/post.php:wp_delete_attachment() | Trash or delete an attachment. |
| wp-includes/class-wp-rewrite.php:WP_Rewrite::rewrite_rules() | Constructs rewrite matches and queries from permalink structure. |
| wp-includes/canonical.php:redirect_canonical() | Redirects incoming links to the proper URL based on the site url. |
| wp-includes/functions.php:get_dirsize() | Get the size of a directory. |
| wp-includes/ms-functions.php:get_active_blog_for_user() | Gets one of a user’s active blogs. |
| wp-includes/user.php:get_user_count() | Returns the number of active users in your installation. |
| wp-includes/class-wp-xmlrpc-server.php:wp_xmlrpc_server::mw_newMediaObject() | Uploads a file, following your settings. |
| wp-includes/class-wp-xmlrpc-server.php:wp_xmlrpc_server::blogger_getUsersBlogs() | Retrieve blogs that user owns. |
| wp-includes/class-wp-xmlrpc-server.php:wp_xmlrpc_server::wp_getUsersBlogs() | Retrieve the blogs of the user. |
| wp-includes/wp-db.php:wpdb::tables() | Returns an array of WordPress tables. |
| wp-includes/wp-db.php:wpdb::print_error() | Prints SQL/DB error. |
| wp-includes/wp-db.php:wpdb::init_charset() | Sets $this->charset and $this->collate. |
| wp-includes/wp-db.php:wpdb::set_prefix() | Sets the table prefix for the WordPress tables. |
| wp-includes/wp-db.php:wpdb::get_blog_prefix() | Gets blog prefix. |
| wp-includes/media-template.php:wp_print_media_templates() | Prints the templates used in the media manager. |
Changelog
| Version | Description |
|---|---|
| 3.0.0 | Introduced. |