Title: Multisite | Page 7 of 11 | Developer.WordPress.org --- # @package: Multisite * hook[wp_is_large_network](https://developer.wordpress.org/reference/hooks/wp_is_large_network/) * Filters whether the network is considered large. * Used by [1 function](https://developer.wordpress.org/reference/hooks/wp_is_large_network/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/wp_is_large_network/#uses) | Source: [wp-includes/ms-functions.php:2729](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2729-L2729) * function[wp_update_network_counts()](https://developer.wordpress.org/reference/functions/wp_update_network_counts/) * Updates the network-wide counts for the current network. * Used by [0 functions](https://developer.wordpress.org/reference/functions/wp_update_network_counts/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/wp_update_network_counts/#uses) | Source: [wp-includes/ms-functions.php:2483](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2483-L2486) * function[wp_maybe_update_network_site_counts()](https://developer.wordpress.org/reference/functions/wp_maybe_update_network_site_counts/) * Updates the count of sites for the current network. * Used by [1 function](https://developer.wordpress.org/reference/functions/wp_maybe_update_network_site_counts/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/wp_maybe_update_network_site_counts/#uses) | Source: [wp-includes/ms-functions.php:2499](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2499-L2517) * hook[enable_live_network_counts](https://developer.wordpress.org/reference/hooks/enable_live_network_counts/) * Filters whether to update network site or user counts when a new site is created. * Used by [3 functions](https://developer.wordpress.org/reference/hooks/enable_live_network_counts/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/enable_live_network_counts/#uses) | Source: [wp-includes/ms-functions.php:2512](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2512-L2512) * hook[blog_redirect_404](https://developer.wordpress.org/reference/hooks/blog_redirect_404/) * Filters the redirect URL for 404s on the main site. * Used by [1 function](https://developer.wordpress.org/reference/hooks/blog_redirect_404/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/blog_redirect_404/#uses) | Source: [wp-includes/ms-functions.php:2200](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2200-L2200) * function[wp_maybe_update_network_user_counts()](https://developer.wordpress.org/reference/functions/wp_maybe_update_network_user_counts/) * Updates the network-wide users count. * Used by [0 functions](https://developer.wordpress.org/reference/functions/wp_maybe_update_network_user_counts/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/wp_maybe_update_network_user_counts/#uses) | Source: [wp-includes/ms-functions.php:2530](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2530-L2539) * function[maybe_add_existing_user_to_blog()](https://developer.wordpress.org/reference/functions/maybe_add_existing_user_to_blog/) * Adds a new user to a blog by visiting /newbloguser/{key}/. * Used by [0 functions](https://developer.wordpress.org/reference/functions/maybe_add_existing_user_to_blog/#used-by) | Uses [8 functions](https://developer.wordpress.org/reference/functions/maybe_add_existing_user_to_blog/#uses) | Source: [wp-includes/ms-functions.php:2222](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2222-L2259) * function[add_existing_user_to_blog()](https://developer.wordpress.org/reference/functions/add_existing_user_to_blog/) * Adds a user to a blog based on details from maybe_add_existing_user_to_blog(). * Used by [1 function](https://developer.wordpress.org/reference/functions/add_existing_user_to_blog/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/add_existing_user_to_blog/#uses) | Source: [wp-includes/ms-functions.php:2275](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2275-L2293) * hook[added_existing_user](https://developer.wordpress.org/reference/hooks/added_existing_user/) * Fires immediately after an existing user is added to a site. * Used by [1 function](https://developer.wordpress.org/reference/hooks/added_existing_user/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/added_existing_user/#uses) | Source: [wp-includes/ms-functions.php:2289](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2289-L2289) * function[add_new_user_to_blog()](https://developer.wordpress.org/reference/functions/add_new_user_to_blog/) * Adds a newly created user to the appropriate blog * Used by [0 functions](https://developer.wordpress.org/reference/functions/add_new_user_to_blog/#used-by) | Uses [5 functions](https://developer.wordpress.org/reference/functions/add_new_user_to_blog/#uses) | Source: [wp-includes/ms-functions.php:2309](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2309-L2326) * function[fix_phpmailer_messageid()](https://developer.wordpress.org/reference/functions/fix_phpmailer_messageid/) * Corrects From host on outgoing mail to match the site domain. * Used by [0 functions](https://developer.wordpress.org/reference/functions/fix_phpmailer_messageid/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/fix_phpmailer_messageid/#uses) | Source: [wp-includes/ms-functions.php:2335](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2335-L2337) * function[is_user_spammy()](https://developer.wordpress.org/reference/functions/is_user_spammy/) * Determines whether a user is marked as a spammer, based on user login. * Used by [2 functions](https://developer.wordpress.org/reference/functions/is_user_spammy/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/is_user_spammy/#uses) | Source: [wp-includes/ms-functions.php:2348](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2348-L2358) * function[update_blog_public()](https://developer.wordpress.org/reference/functions/update_blog_public/) * Updates this blog’s ‘public’ setting in the global blogs table. * Used by [0 functions](https://developer.wordpress.org/reference/functions/update_blog_public/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/update_blog_public/#uses) | Source: [wp-includes/ms-functions.php:2370](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2370-L2372) * function[users_can_register_signup_filter()](https://developer.wordpress.org/reference/functions/users_can_register_signup_filter/) * Determines whether users can self-register, based on Network settings. * Used by [0 functions](https://developer.wordpress.org/reference/functions/users_can_register_signup_filter/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/users_can_register_signup_filter/#uses) | Source: [wp-includes/ms-functions.php:2381](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2381-L2384) * function[welcome_user_msg_filter()](https://developer.wordpress.org/reference/functions/welcome_user_msg_filter/) * Ensures that the welcome message is not empty. Currently unused. * Used by [0 functions](https://developer.wordpress.org/reference/functions/welcome_user_msg_filter/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/welcome_user_msg_filter/#uses) | Source: [wp-includes/ms-functions.php:2394](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2394-L2416) * function[force_ssl_content()](https://developer.wordpress.org/reference/functions/force_ssl_content/) * Determines whether to force SSL on content. * Used by [1 function](https://developer.wordpress.org/reference/functions/force_ssl_content/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/force_ssl_content/#uses) | Source: [wp-includes/ms-functions.php:2426](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2426-L2436) * function[filter_SSL()](https://developer.wordpress.org/reference/functions/filter_ssl/) * Formats a URL to use https. * Used by [0 functions](https://developer.wordpress.org/reference/functions/filter_ssl/#used-by) | Uses [4 functions](https://developer.wordpress.org/reference/functions/filter_ssl/#uses) | Source: [wp-includes/ms-functions.php:2448](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2448-L2458) * function[wp_schedule_update_network_counts()](https://developer.wordpress.org/reference/functions/wp_schedule_update_network_counts/) * Schedules update of the network-wide counts for the current network. * Used by [0 functions](https://developer.wordpress.org/reference/functions/wp_schedule_update_network_counts/#used-by) | Uses [4 functions](https://developer.wordpress.org/reference/functions/wp_schedule_update_network_counts/#uses) | Source: [wp-includes/ms-functions.php:2465](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2465-L2473) * function[signup_nonce_fields()](https://developer.wordpress.org/reference/functions/signup_nonce_fields/) * Adds a nonce field to the signup page. * Used by [0 functions](https://developer.wordpress.org/reference/functions/signup_nonce_fields/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/signup_nonce_fields/#uses) | Source: [wp-includes/ms-functions.php:2158](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2158-L2162) * function[signup_nonce_check()](https://developer.wordpress.org/reference/functions/signup_nonce_check/) * Processes the signup nonce created in signup_nonce_fields(). * Used by [0 functions](https://developer.wordpress.org/reference/functions/signup_nonce_check/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/signup_nonce_check/#uses) | Source: [wp-includes/ms-functions.php:2172](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2172-L2182) * function[maybe_redirect_404()](https://developer.wordpress.org/reference/functions/maybe_redirect_404/) * Corrects 404 redirects when NOBLOGREDIRECT is defined. * Used by [0 functions](https://developer.wordpress.org/reference/functions/maybe_redirect_404/#used-by) | Uses [5 functions](https://developer.wordpress.org/reference/functions/maybe_redirect_404/#uses) | Source: [wp-includes/ms-functions.php:2189](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2189-L2211) * hook[update_welcome_email](https://developer.wordpress.org/reference/hooks/update_welcome_email/) * Filters the content of the welcome email sent to the site administrator after site activation. * Used by [1 function](https://developer.wordpress.org/reference/hooks/update_welcome_email/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/update_welcome_email/#uses) | Source: [wp-includes/ms-functions.php:1712](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L1712-L1712) * hook[update_welcome_subject](https://developer.wordpress.org/reference/hooks/update_welcome_subject/) * Filters the subject of the welcome email sent to the site administrator after site activation. * Used by [1 function](https://developer.wordpress.org/reference/hooks/update_welcome_subject/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/update_welcome_subject/#uses) | Source: [wp-includes/ms-functions.php:1738](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L1738-L1738) * function[wpmu_welcome_user_notification()](https://developer.wordpress.org/reference/functions/wpmu_welcome_user_notification/) * Notifies a user that their account activation has been successful. * Used by [0 functions](https://developer.wordpress.org/reference/functions/wpmu_welcome_user_notification/#used-by) | Uses [14 functions](https://developer.wordpress.org/reference/functions/wpmu_welcome_user_notification/#uses) | Source: [wp-includes/ms-functions.php:1878](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L1878-L1958) * hook[wpmu_welcome_user_notification](https://developer.wordpress.org/reference/hooks/wpmu_welcome_user_notification/) * Filters whether to bypass the welcome email after user activation. * Used by [1 function](https://developer.wordpress.org/reference/hooks/wpmu_welcome_user_notification/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/wpmu_welcome_user_notification/#uses) | Source: [wp-includes/ms-functions.php:1897](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L1897-L1897) * hook[update_welcome_user_email](https://developer.wordpress.org/reference/hooks/update_welcome_user_email/) * Filters the content of the welcome email after user activation. * Used by [1 function](https://developer.wordpress.org/reference/hooks/update_welcome_user_email/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/update_welcome_user_email/#uses) | Source: [wp-includes/ms-functions.php:1919](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L1919-L1919) * hook[update_welcome_user_subject](https://developer.wordpress.org/reference/hooks/update_welcome_user_subject/) * Filters the subject of the welcome email after user activation. * Used by [1 function](https://developer.wordpress.org/reference/hooks/update_welcome_user_subject/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/update_welcome_user_subject/#uses) | Source: [wp-includes/ms-functions.php:1949](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L1949-L1949) * function[get_current_site()](https://developer.wordpress.org/reference/functions/get_current_site/) * Gets the current network. * Used by [0 functions](https://developer.wordpress.org/reference/functions/get_current_site/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/get_current_site/#uses) | Source: [wp-includes/ms-functions.php:1974](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L1974-L1977) * function[get_most_recent_post_of_user()](https://developer.wordpress.org/reference/functions/get_most_recent_post_of_user/) * Gets a user’s most recent post. * Used by [0 functions](https://developer.wordpress.org/reference/functions/get_most_recent_post_of_user/#used-by) | Uses [4 functions](https://developer.wordpress.org/reference/functions/get_most_recent_post_of_user/#uses) | Source: [wp-includes/ms-functions.php:1992](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L1992-L2027) * function[check_upload_mimes()](https://developer.wordpress.org/reference/functions/check_upload_mimes/) * Checks an array of MIME types against a list of allowed types. * Used by [0 functions](https://developer.wordpress.org/reference/functions/check_upload_mimes/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/check_upload_mimes/#uses) | Source: [wp-includes/ms-functions.php:2047](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ms-functions.php#L2047-L2058) [Previous Page](https://developer.wordpress.org/reference/package/multisite/page/6/?output_format=md) [1](https://developer.wordpress.org/reference/package/multisite/?output_format=md)… [5](https://developer.wordpress.org/reference/package/multisite/page/5/?output_format=md) 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