clean_user_cache( WP_User|int $user )

function clean_user_cache( $user ) {
	if ( is_numeric( $user ) )
		$user = new WP_User( $user );

	if ( ! $user->exists() )
		return;

	wp_cache_delete( $user->ID, 'users' );
	wp_cache_delete( $user->user_login, 'userlogins' );
	wp_cache_delete( $user->user_email, 'useremail' );
	wp_cache_delete( $user->user_nicename, 'userslugs' );

	/**
	 * Fires immediately after the given user's cache is cleaned.
	 *
	 * @since WP-4.4.0
	 *
	 * @param int     $user_id User ID.
	 * @param WP_User $user    User object.
	 */
	do_action( 'clean_user_cache', $user->ID, $user );
}