apply_filters( 'pre_user_nicename', string $user_nicename ) Filters a user’s nicename before the user is created or updated. ContentsParameters Source Related Used By Changelog User Contributed Notes Parameters $user_nicename (string) The user's nicename. Top ↑Source File: wp-includes/user.php View on Trac Top ↑Related Top ↑Used By Used By Used By Description wp-includes/user.php: wp_insert_user() Inserts a user into the database. Top ↑Changelog Changelog Version Description 2.0.3 Introduced. Top ↑User Contributed Notes You must log in before being able to contribute a note or feedback.