Get the size of a directory recursively.

Ensures that the current site’s domain is listed in the allowed redirect host list.

Clear the blog details cache.

Removes a user from a blog.

Restore the current blog, after calling switch_to_blog().

Generates and displays the Sign-up and Create Site forms.

Displays the fields for the new user account registration form.

Shows a form for returning users to sign up for another site.

Shows a form for a user or visitor to sign up for a new site.

Processes the signup nonce created in signup_nonce_fields().