groups_total_groups_for_user( int $user_id )

function groups_total_groups_for_user( $user_id = 0 ) {

	if ( empty( $user_id ) )
		$user_id = ( bp_displayed_user_id() ) ? bp_displayed_user_id() : bp_loggedin_user_id();

	$count = wp_cache_get( 'bp_total_groups_for_user_' . $user_id, 'bp' );

	if ( false === $count ) {
		$count = BP_Groups_Member::total_group_count( $user_id );
		wp_cache_set( 'bp_total_groups_for_user_' . $user_id, $count, 'bp' );
	}

	return (int) $count;
}