is_multisite()

If Multisite is enabled.

Return

(bool) True if Multisite is enabled, false otherwise.

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;
}

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Related

Used By

Used By
Used By Description
wp-login.php: retrieve_password()

Handles sending password retrieval email to user.
wp-includes/deprecated.php: wp_admin_bar_dashboard_view_site_menu()

Add the “Dashboard”/”Visit Site” menu.
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/general-template.php: get_login_image_html()

Return the HTML for the image on the login screen. This is either a link showing the ClassicPress logo (the default) or the site’s custom login image (if enabled).
wp-includes/general-template.php: get_site_icon_url()

Returns the Site Icon URL.
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.
wp-includes/class-wp-user-query.php: WP_User_Query::prepare_query()

Prepare the query variables.
wp-includes/script-loader.php: wp_default_scripts()

Register all ClassicPress scripts.
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::create_item()

Creates a single user.
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::check_role_update()

Determines if the current user is allowed to make the desired roles change.
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-user.php: WP_User::get_role_caps()

Retrieve all of the role capabilities and merge with individual capabilities.
wp-includes/class-wp-user.php: WP_User::has_cap()

Whether the user has a specific capability.
wp-includes/media.php: wp_plupload_default_settings()

Prints default Plupload 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/default-constants.php: wp_initial_constants()

Defines initial ClassicPress constants
wp-includes/media-template.php: wp_print_media_templates()

Prints the templates used in the media manager.
wp-includes/admin-bar.php: wp_admin_bar_new_content_menu()

Add “Add New” menu.
wp-includes/admin-bar.php: wp_admin_bar_wp_menu()

Add the ClassicPress logo menu.
wp-includes/admin-bar.php: wp_admin_bar_my_account_item()

Add the “My Account” item.
wp-includes/admin-bar.php: wp_admin_bar_my_account_menu()

Add the “My Account” submenu items.
wp-includes/admin-bar.php: wp_admin_bar_site_menu()

Add the “Site Name” menu.
wp-includes/admin-bar.php: wp_admin_bar_my_sites_menu()

Add the “My Sites/[Site Name]” menu and all submenus.
wp-includes/embed.php: wp_filter_pre_oembed_result()

Filters the oEmbed result before any HTTP requests are made.
wp-includes/class-wp-admin-bar.php: WP_Admin_Bar::initialize()
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_dashboard_url()

Retrieves the URL to the user’s dashboard.
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 ClassicPress application files (e.g. wp-blog-header.php or the wp-admin/ folder) are accessible.
wp-includes/capabilities.php: is_super_admin()

Determine if user is a site admin.
wp-includes/capabilities.php: grant_super_admin()

Grants Super Admin privileges.
wp-includes/capabilities.php: revoke_super_admin()

Revokes Super Admin privileges.
wp-includes/capabilities.php: map_meta_cap()

Map meta capabilities to primitive capabilities.
wp-includes/capabilities.php: current_user_can_for_blog()

Whether the current user has a specific capability for a given site.
wp-includes/user.php: wp_get_users_with_no_role()

Get 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/user.php: get_blogs_of_user()

Get the sites a user belongs to.
wp-includes/user.php: is_user_member_of_blog()

Find out whether a user is a member of a given blog.
wp-includes/user.php: count_users()

Count number of users who have each of the user roles.
wp-includes/wp-db.php: wpdb::init_charset()

Set $this->charset and $this->collate
wp-includes/wp-db.php: wpdb::set_prefix()

Sets the table prefix for the ClassicPress tables.
wp-includes/wp-db.php: wpdb::get_blog_prefix()

Gets blog prefix.
wp-includes/wp-db.php: wpdb::tables()

Returns an array of ClassicPress tables.
wp-includes/wp-db.php: wpdb::print_error()

Print SQL/DB error.
wp-includes/user.php: wp_authenticate_spam_check()

For Multisite blogs, check if the authenticated user has been marked as a spammer, or if the user’s primary blog has been marked as spam.
wp-includes/class-wp-theme.php: WP_Theme::is_allowed()

Whether the theme is allowed (multisite only).
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::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/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::mw_newMediaObject()

Uploads a file, following your settings.
wp-includes/theme.php: wp_get_themes()

Returns an array of WP_Theme objects based on the arguments.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getUsersBlogs()

Retrieve the blogs of the user.
wp-includes/option.php: register_initial_settings()

Register default settings available in ClassicPress.
wp-includes/option.php: get_network_option()

Retrieve a network’s option value based on the option name.
wp-includes/option.php: add_network_option()

Add a new network option.
wp-includes/option.php: delete_network_option()

Removes a network option by name.
wp-includes/option.php: update_network_option()

Update the value of a network option that was already added.
wp-includes/option.php: delete_expired_transients()

Deletes all expired transients.
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/option.php: wp_load_alloptions()

Loads and caches all autoloaded options, if available or all options.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::enqueue_control_scripts()

Enqueue scripts for customize controls.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::register_controls()

Register some default controls.
wp-includes/cache.php: WP_Object_Cache::__construct()

Sets up object properties; PHP 5 style constructor.
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/rest-api.php: get_rest_url()

Retrieves the URL to a REST endpoint on a site.
wp-includes/post.php: wp_delete_attachment()

Trash or delete an attachment.
wp-includes/class-wp-roles.php: WP_Roles::get_roles_data()

Gets the available roles data.
wp-includes/ms-functions.php: get_active_blog_for_user()

Get one of a user’s active blogs
wp-includes/formatting.php: sanitize_option()

Sanitises various option values based on the nature of the option.
wp-includes/load.php: get_current_network_id()

Retrieves the current network ID.
wp-includes/load.php: wp_not_installed()

Redirect to the installer if ClassicPress is not installed.
wp-includes/load.php: wp_get_active_and_valid_plugins()

Retrieve an array of active and valid plugin files.
wp-includes/update.php: wp_version_check()

Check WordPress version against the newest version.
wp-includes/functions.php: is_main_site()

Determine whether a site is the main site of the current network.
wp-includes/functions.php: get_main_site_id()

Gets the main site ID.
wp-includes/functions.php: is_main_network()

Determine whether a network is the main network of the Multisite installation.
wp-includes/functions.php: get_main_network_id()

Get the main network ID.
wp-includes/functions.php: global_terms_enabled()

Determine whether global terms are enabled.
wp-includes/functions.php: _wp_upload_dir()

A non-filtered, non-cached version of wp_upload_dir() that doesn’t check the path.
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-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/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/misc.php: update_home_siteurl()

Flushes rewrite rules if siteurl, home or page_on_front changed.
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: save_mod_rewrite_rules()

Updates the htaccess file with the current rules if it is writable.
wp-admin/includes/media.php: media_upload_form()

Outputs the legacy media upload form.
wp-admin/includes/schema.php: populate_network()

Populate network settings.
wp-admin/includes/network.php: network_step2()

Prints step 2 for Network installation process.
wp-admin/includes/schema.php: wp_get_db_schema()

Retrieve the SQL for creating database tables.
wp-admin/includes/schema.php: populate_options()

Create ClassicPress options and set the default values.
wp-admin/includes/class-wp-importer.php: WP_Importer::set_blog()
wp-admin/includes/class-theme-upgrader.php: Theme_Upgrader::bulk_upgrade()

Upgrade several themes at once.
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-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/upgrade.php: pre_schema_upgrade()

Runs before the schema is upgraded.
wp-admin/includes/upgrade.php: wp_install_defaults()

Creates the initial content for a newly-installed site.
wp-admin/includes/upgrade.php: wp_upgrade()

Runs ClassicPress Upgrade functions.
wp-admin/includes/theme.php: delete_theme()

Remove a theme
wp-admin/includes/theme.php: get_theme_update_available()

Retrieve the update link if there is a theme update available.
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/plugin.php: is_plugin_active_for_network()

Check 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()

Deactivate a single plugin or multiple plugins.
wp-admin/includes/plugin.php: validate_active_plugins()

Validate active plugins
wp-admin/includes/plugin.php: _get_dropins()

Returns drop-ins that ClassicPress uses.
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/export.php: wxr_site_url()

Return the URL of the site
wp-admin/includes/file.php: _wp_handle_upload()

Handle PHP uploads in ClassicPress, sanitizing file names, checking extensions for mime type, and moving the file to the appropriate directory within the uploads directory.
wp-admin/includes/class-plugin-installer-skin.php: Plugin_Installer_Skin::after()
wp-admin/includes/dashboard.php: wp_dashboard_quota()

Display file upload quota on dashboard.
wp-admin/includes/update.php: wp_plugin_update_row()

Displays update information for a plugin.
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::bulk_upgrade()

Bulk upgrade several plugins at once.
wp-admin/includes/update.php: update_nag()
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.
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Changelog
Version Description
WP-3.0.0 Introduced.