以下为WPMU额外函数并构成其API：

目前我们遇到诸多问题都是因为缺乏相关资料。如果你能帮上忙的话，可以为这些函数创建相应的页面，并将它们标记为WPMU分类下的内容。

• function add_blog_option ( $id, $key, $value )
• function add_site_option ( $key, $value )
• function add_user_to_blog ( $blog_id, $user_id, $role )
• function create_empty_blog ( $domain, $path, $weblog_title, $site_id = 1 )
• function delete_blog_option ( $id, $key )
• function domain_exists ($domain, $path, $site_id = 1)
• function generate_random_password ()
• function get_active_blog_for_user ( $user_id ) { // 为用户获取活动的blog – 可以是primary blog或blog列表
• function get_admin_users_for_domain ( $sitedomain = , $path = )
• function get_blog_count ( $id = 0 )
• function get_blog_details ( $id, $all = true )
• function get_blog_list ( $start = 0, $num = 10, $display = true )
• function get_blog_option ( $blog_id, $setting, $default=’na’ )
• function get_blog_permalink ( $blog_id, $post_id )
• function get_blog_post ( $blog_id, $post_id )
• function get_blog_status ( $id, $pref )
• function get_blogaddress_by_domain ( $domain, $path )
• function get_blogaddress_by_id ( $blog_id )
• function get_blogaddress_by_name ( $blogname )
• function get_bloginfo ( $blogparam)
• function get_blogs_of_user ( $id, $all = false )
• function get_current_site ()
• function get_current_user_id ()
• function get_last_updated ( $display = false )
• function get_most_active_blogs ( $num = 10, $display = true )
• function get_site_option ( $key, $default = false, $use_cache = true )
• function get_sitestats ()
• function get_user_details ( $username )
• function get_user_id_from_string ( $string )
• function insert_blog ($domain, $path, $site_id)
• function install_blog ($blog_id, $blog_title = )
• function install_blog_defaults ($blog_id, $user_id)
• function is_archived ( $id )
• function is_blog_user ( $blog_id = 0 )
• function is_email_address_unsafe ( $user_email )
• function is_site_admin ( $user_login = false )
• function is_user_member_of_blog ( $user_id, $blog_id = 0 )
• function load_muplugin_textdomain ($domain, $path = false)
• function refresh_blog_details ( $id )
• function remove_user_from_blog ($user_id, $blog_id = )
• function restore_current_blog ()
• function switch_to_blog ( $new_blog )
• function update_archived ( $id, $archived )
• function update_blog_option ( $id, $key, $value, $refresh = true )
• function update_blog_status ( $id, $pref, $value, $refresh = 1 )
• function update_site_option ( $key, $value )
• function validate_email ( $email, $check_domain = true)
• function wpmu_activate_signup ($key)
• function wpmu_admin_do_redirect ( $url = )
• function wpmu_admin_redirect_add_updated_param ( $url = )
• function wpmu_admin_redirect_url ()
• function wpmu_checkAvailableSpace ($action)
• function wpmu_create_blog ($domain, $path, $title, $user_id, $meta = , $site_id = 1)
• function wpmu_create_user ( $user_name, $password, $email)
• function wpmu_signup_blog ($domain, $path, $title, $user, $user_email, $meta = )
• function wpmu_signup_blog_notification ($domain, $path, $title, $user, $user_email, $key, $meta = )
• function wpmu_signup_user ($user, $user_email, $meta = )
• function wpmu_signup_user_notification ($user, $user_email, $key, $meta = )
• function wpmu_update_blogs_date ()
• function wpmu_validate_blog_signup ($blog_id, $blog_title, $user = )
• function wpmu_validate_user_signup ($user_name, $user_email)
• function wpmu_welcome_notification ($blog_id, $user_id, $password, $title, $meta = )
• function wpmu_welcome_user_notification ($user_id, $password, $meta = )