Ensure that the welcome message is not empty. Currently unused.
update_blog_public
Update this blog’s ‘public’ setting in the global blogs table.
users_can_register_signup_filter
Check whether users can self-register, based on Network settings.
is_user_spammy
Check to see whether a user is marked as a spammer, based on user login.
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fix_phpmailer_messageid
Correct From host on outgoing mail to match the site domain
added_existing_user
Fires immediately after an existing user is added to a site.
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().
upload_is_file_too_big
Check whether an upload is too big.
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signup_nonce_fields
Add a nonce field to the signup page.
redirect_this_site
Ensure that the current site’s domain is listed in the allowed redirect host list.
update_posts_count
Update a blog’s post count.
