user_admin_url( string $path = '', string $scheme = 'admin' )

function user_admin_url( $path = '', $scheme = 'admin' ) {
	$url = network_site_url('wp-admin/user/', $scheme);

	if ( $path && is_string( $path ) )
		$url .= ltrim($path, '/');

	/**
	 * Filters the user admin URL for the current user.
	 *
	 * @since WP-3.1.0
	 *
	 * @param string $url  The complete URL including scheme and path.
	 * @param string $path Path relative to the URL. Blank string if
	 *                     no path is specified.
	 */
	return apply_filters( 'user_admin_url', $url, $path );
}