clean_user_cache() WordPress Function

function clean_user_cache( $user ) {
	global $current_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 4.4.0
	 *
	 * @param int     $user_id User ID.
	 * @param WP_User $user    User object.
	 */
	do_action( 'clean_user_cache', $user->ID, $user );

	// Refresh the global user instance if the cleaning current user.
	if ( get_current_user_id() === (int) $user->ID ) {
		$user_id      = (int) $user->ID;
		$current_user = null;
		wp_set_current_user( $user_id, '' );
	}
}