Adds a user to a blog based on details from maybe_add_existing_user_to_blog().

Adds a newly created user to the appropriate blog

Adds a user to a blog, along with specifying the user’s role.

Checks an array of MIME types against a list of allowed types.

Checks whether a site name is already taken.

Formats a URL to use https.

Corrects From host on outgoing mail to match the site domain

Determines whether to force SSL on content.

Gets one of a user’s active blogs.

Gets the number of active sites on the installation.