wp_user_settings()

function wp_user_settings() {

	if ( ! is_admin() || wp_doing_ajax() ) {
		return;
	}

	if ( ! $user_id = get_current_user_id() ) {
		return;
	}

	if ( ! is_user_member_of_blog() ) {
		return;
	}

	$settings = (string) get_user_option( 'user-settings', $user_id );

	if ( isset( $_COOKIE['wp-settings-' . $user_id] ) ) {
		$cookie = preg_replace( '/[^A-Za-z0-9=&_]/', '', $_COOKIE['wp-settings-' . $user_id] );

		// No change or both empty
		if ( $cookie == $settings )
			return;

		$last_saved = (int) get_user_option( 'user-settings-time', $user_id );
		$current = isset( $_COOKIE['wp-settings-time-' . $user_id]) ? preg_replace( '/[^0-9]/', '', $_COOKIE['wp-settings-time-' . $user_id] ) : 0;

		// The cookie is newer than the saved value. Update the user_option and leave the cookie as-is
		if ( $current > $last_saved ) {
			update_user_option( $user_id, 'user-settings', $cookie, false );
			update_user_option( $user_id, 'user-settings-time', time() - 5, false );
			return;
		}
	}

	// The cookie is not set in the current browser or the saved value is newer.
	$secure = ( 'https' === parse_url( admin_url(), PHP_URL_SCHEME ) );
	setcookie( 'wp-settings-' . $user_id, $settings, time() + YEAR_IN_SECONDS, SITECOOKIEPATH, null, $secure );
	setcookie( 'wp-settings-time-' . $user_id, time(), time() + YEAR_IN_SECONDS, SITECOOKIEPATH, null, $secure );
	$_COOKIE['wp-settings-' . $user_id] = $settings;
}