Filters the number of custom fields to retrieve for the drop-down in the Custom Fields meta box.

Filters the DISTINCT clause of the query.

Filters the SELECT clause of the query.

Filters a comment’s approval status before it is set.

Filters whether to preempt the XML-RPC media upload.

Filters the database query.

Filters the query string before parsing.

Fires following the ‘Email’ field in the user registration form.

Fires when submitting registration form data, before the user is created.

Filters the errors encountered when a new user is being registered.