public static function get_user_memberships( $user_id, $args = array() ) {
		global $wpdb;

		$bp = buddypress();

		$r = array_merge( array(
			'page'     => 1,
			'per_page' => 20,
			'type'     => 'membership',
		), $args );

		$sql = array(
			'select' => 'SELECT *',
			'from'   => "FROM {$bp->groups->table_name_members}",
			'where'  => '',
			'limits' => '',
		);

		switch ( $r['type'] ) {
			case 'pending_request' :
				return groups_get_requests( array(
					'user_id'  => $user_id,
					'page'     => $r['page'],
					'per_page' => $r['per_page'],
				) );
			break;

			case 'pending_received_invitation' :
				return groups_get_invites( array(
					'user_id'  => $user_id,
					'page'     => $r['page'],
					'per_page' => $r['per_page'],
				) );
			break;

			case 'pending_sent_invitation' :
				return groups_get_invites( array(
					'inviter_id'  => $user_id,
					'page'        => $r['page'],
					'per_page'    => $r['per_page'],
				) );
			break;

			case 'membership' :
			default :
				$sql['where'] = $wpdb->prepare( "user_id = %d AND is_confirmed = 1", $user_id );
			break;
		}

		if ( $r['page'] && $r['per_page'] ) {
			$sql['limits'] = $wpdb->prepare( "LIMIT %d, %d", ( $r['page'] - 1 ) * $r['per_page'], $r['per_page'] );
		}

		$memberships = $wpdb->get_results( "{$sql['select']} {$sql['from']} WHERE {$sql['where']} {$sql['limits']}" );

		foreach ( $memberships as &$membership ) {
			$membership->id           = (int) $membership->id;
			$membership->group_id     = (int) $membership->group_id;
			$membership->user_id      = (int) $membership->user_id;
			$membership->inviter_id   = (int) $membership->inviter_id;
			$membership->is_admin     = (int) $membership->is_admin;
			$membership->is_mod       = (int) $membership->is_mod;
			$membership->is_banned    = (int) $membership->is_banned;
			$membership->is_confirmed = (int) $membership->is_confirmed;
			$membership->invite_sent  = (int) $membership->invite_sent;
		}

		return $memberships;
	}