Check to see whether a user is marked as a spammer, based on user login.
fix_phpmailer_messageid
Correct From host on outgoing mail to match the site domain
add_new_user_to_blog
Adds a newly created user to the appropriate blog
add_existing_user_to_blog
Add a user to a blog based on details from maybe_add_existing_user_to_blog().
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maybe_add_existing_user_to_blog
Add a new user to a blog by visiting /newbloguser/{key}/.
maybe_redirect_404
Correct 404 redirects when NOBLOGREDIRECT is defined.
signup_nonce_check
Process the signup nonce created in signup_nonce_fields().
signup_nonce_fields
Add a nonce field to the signup page.
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upload_is_file_too_big
Check whether an upload is too big.
redirect_this_site
Ensure that the current site’s domain is listed in the allowed redirect host list.
global_terms
Maintains a canonical list of terms by syncing terms created for each blog with the global terms table.
wpmu_log_new_registrations
Logs the user email, IP, and registration date of a new site.
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update_posts_count
Update a blog’s post count.
check_upload_mimes
Check an array of MIME types against a whitelist.
get_most_recent_post_of_user
Get a user’s most recent post.