is_multisite(): bool

Determines whether Multisite is enabled.

Return
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Return

bool True if Multisite is enabled, false otherwise.

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Usage

if ( is_multisite() ) { echo 'Multisite is enabled'; }

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Source

File: wp-includes/load.php. View all references

function is_multisite() {
	if ( defined( 'MULTISITE' ) ) {
		return MULTISITE;
	}

	if ( defined( 'SUBDOMAIN_INSTALL' ) || defined( 'VHOST' ) || defined( 'SUNRISE' ) ) {
		return true;
	}

	return false;
}

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Used By

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