function bp_core_current_user_ua() {

	// Sanity check the user agent.
	if ( ! empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
		$retval = substr( $_SERVER['HTTP_USER_AGENT'], 0, 254 );
	} else {
		$retval = '';
	}

	/**
	 * Filters the current user's user-agent.
	 *
	 * @since 1.6.0
	 *
	 * @param string $retval Current user's user-agent.
	 */
	return apply_filters( 'bp_core_current_user_ua', $retval );
}