Why Multisite?Why Not Multisite?Multisite AlternativesMultiple Authors or Categories on the Same WordPress SiteCustom Post TypesTotally Separate SitesUse a WordPress Maintenance ServiceMultitenancySetting Up a Multisite NetworkManaging a Multisite NetworkDashboardSitesUsersThemesPluginsSettingsUpdatesMultisite Database StructureNetworkwide TablesIndividual Site TablesShared Site TablesDomain MappingRandom Useful Multisite PluginsGravity Forms User Registration Add-OnMember Network Sites Add-On for Paid Memberships ProMore Privacy OptionsMultisite Global MediaMultisite Plugin ManagerMultisite Global SearchMultisite Robots.txt ManagerNS Cloner: Site CopierWP Multi NetworkBasic Multisite Functionality$blog_idis_multisite()get_current_blog_id()switch_to_blog( $new_blog )restore_current_blog()get_blog_details( $fields = null, $get_all = true )update_blog_details( $blog_id, $details = array() )get_blog_status( $id, $pref )update_blog_status( $blog_id, $pref, $value )get_blog_option( $id, $option, $default = false )update_blog_option( $id, $option, $value )delete_blog_option( $id, $option )get_blog_post( $blog_id, $post_id )add_user_to_blog( $blog_id, $user_id, $role )wpmu_delete_user( $user_id )create_empty_blog( $domain, $path, $weblog_title, $site_id = 1 )Functions We Didn’t Mention