WordPress Multisite Function lists

Below are the lists of WordPress multisite function. This list also includes the deprecated functions. Function with red colour is deprecated in new version of WordPress.

Multisite WordPress API, found in file wp-includes/ms-functions.php (since 3.0.0).

WordPress Multisite Function lists

Below are the list of WordPress Multisite functions list:

  • add_existing_user_to_blog
  • add_new_user_to_blog
  • add_user_to_blog
  • check_upload_mimes
  • create_empty_blog
  • domain_exists
  • filter_SSL
  • fix_phpmailer_messageid
  • force_ssl_content
  • get_active_blog_for_user
  • get_admin_users_for_domain
  • get_blogs_of_user
  • get_blog_count
  • get_blog_id_from_url
  • get_blog_permalink
  • get_blog_post
  • get_current_site
  • get_dashboard_blog
  • get_dirsize
  • get_most_recent_post_of_user
  • get_sitestats
  • get_space_allowed
  • get_space_used
  • get_upload_space_available
  • get_user_count
  • get_user_id_from_string (deprecated)
  • global_terms
  • insert_blog
  • install_blog
  • install_blog_defaults
  • is_blog_user (deprecated)
  • is_email_address_unsafe
  • is_upload_space_available
  • is_user_option_local
  • is_user_spammy
  • maybe_add_existing_user_to_blog
  • maybe_redirect_404
  • newblog_notify_siteadmin
  • newuser_notify_siteadmin
  • recurse_dirsize
  • redirect_mu_dashboard (not a function??)
  • redirect_this_site
  • remove_user_from_blog
  • signup_nonce_check
  • signup_nonce_fields
  • update_blog_public
  • update_posts_count
  • upload_is_file_too_big
  • upload_is_user_over_quota
  • upload_size_limit_filter
  • users_can_register_signup_filter
  • welcome_user_msg_filter
  • wordpressmu_wp_mail_from (not a function??)
  • wp_get_sites
  • wpmu_activate_signup
  • wpmu_admin_redirect_add_updated_param (deprecated)
  • wpmu_create_blog
  • wpmu_create_user
  • wpmu_log_new_registrations
  • wpmu_signup_blog
  • wpmu_signup_blog_notification
  • wpmu_signup_user
  • wpmu_signup_user_notification
  • wpmu_validate_blog_signup
  • wpmu_validate_user_signup
  • wpmu_welcome_notification
  • wpmu_welcome_user_notification

These functions are needed to load Multisite, found in file wp-includes/ms-load.php (since 3.0.0).

  • get_current_site_name (deprecated)
  • is_subdomain_install
  • ms_not_installed
  • ms_site_check
  • wpmu_current_site (deprecated)

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Prem Tiwari

An engineer by profession and a passionate blogger by heart. Founder of FreeWebMentor.com (A Programming blog for beginners), Tech Speaker at various forums. A part from this he is an open source enthusiast, WordPress Lover, Blogger, SEO, and Growth Strategic.


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