bp_nouveau_ajax_querystring( string $query_string, string $object )

function bp_nouveau_ajax_querystring( $query_string, $object ) {
	if ( empty( $object ) ) {
		return '';
	}

	// Default query
	$post_query = array(
		'filter'       => '',
		'scope'        => 'all',
		'page'         => 1,
		'search_terms' => '',
		'extras'       => '',
	);

	if ( ! empty( $_POST ) ) {

		$post_query = wp_parse_args( $_POST, $post_query );

		// Make sure to transport the scope, filter etc.. in HeartBeat Requests
		if ( ! empty( $post_query['data']['bp_heartbeat'] ) ) {
			$bp_heartbeat = $post_query['data']['bp_heartbeat'];

			// Remove heartbeat specific vars
			$post_query = array_diff_key(
				wp_parse_args( $bp_heartbeat, $post_query ),
				array(
					'data'      => false,
					'interval'  => false,
					'_nonce'    => false,
					'action'    => false,
					'screen_id' => false,
					'has_focus' => false,
				)
			);
		}
	}

	// Init the query string
	$qs = array();

	// Activity feed filtering on action.
	if ( ! empty( $post_query['filter'] ) && '-1' !== $post_query['filter'] ) {
		if ( 'notifications' === $object ) {
			$qs[] = 'component_action=' . $post_query['filter'];
		} else {
			$qs[] = 'type=' . $post_query['filter'];
			$qs[] = 'action=' . $post_query['filter'];
		}
	}

	// Sort the notifications if needed
	if ( ! empty( $post_query['extras'] ) && 'notifications' === $object ) {
		$qs[] = 'sort_order=' . $post_query['extras'];
	}

	if ( 'personal' === $post_query['scope'] ) {
		$user_id = ( bp_displayed_user_id() ) ? bp_displayed_user_id() : bp_loggedin_user_id();
		$qs[]    = 'user_id=' . $user_id;
	}

	// Activity feed scope only on activity directory.
	if ( 'all' !== $post_query['scope'] && ! bp_displayed_user_id() && ! bp_is_single_item() ) {
		$qs[] = 'scope=' . $post_query['scope'];
	}

	// If page have been passed via the AJAX post request, use those.
	if ( '-1' != $post_query['page'] ) {
		$qs[] = 'page=' . absint( $post_query['page'] );
	}

	// Excludes activity just posted and avoids duplicate ids.
	if ( ! empty( $post_query['exclude_just_posted'] ) ) {
		$just_posted = wp_parse_id_list( $post_query['exclude_just_posted'] );
		$qs[]        = 'exclude=' . implode( ',', $just_posted );
	}

	// To get newest activities.
	if ( ! empty( $post_query['offset'] ) ) {
		$qs[] = 'offset=' . intval( $post_query['offset'] );
	}

	if ( isset( $_POST['member_type_id'] ) && '' !== $_POST['member_type_id'] && 'all' !== $_POST['member_type_id'] && 'undefined' !== $_POST['member_type_id'] ) {
		$member_type_id = $_POST['member_type_id'];
		$member_type_key= get_post_meta( $member_type_id, '_bp_member_type_key', true);
		$qs[] = 'member_type=' . $member_type_key;
	}

	if ( isset( $_POST['group_type'] ) && '' !== $_POST['group_type'] && 'all' !== $_POST['group_type'] && 'undefined' !== $_POST['group_type'] ) {
		$group_type = $_POST['group_type'];
		$qs[] = 'group_type=' . $group_type;
	}

	$object_search_text = bp_get_search_default_text( $object );
	if ( ! empty( $post_query['search_terms'] ) && $object_search_text != $post_query['search_terms'] && 'false' != $post_query['search_terms'] && 'undefined' != $post_query['search_terms'] ) {
		$qs[] = 'search_terms=' . urlencode( $_POST['search_terms'] );
	}

	// Specific to messages
	if ( 'messages' === $object ) {
		if ( ! empty( $post_query['box'] ) ) {
			$qs[] = 'box=' . $post_query['box'];
		}
	}

	// Single activity.
	if ( bp_is_single_activity() ) {
		$qs = array(
			'display_comments=threaded',
			'show_hidden=true',
			'include=' . bp_current_action(),
		);
	}

	// Now pass the querystring to override default values.
	$query_string = empty( $qs ) ? '' : join( '&', (array) $qs );


	// List the variables for the filter
	list( $filter, $scope, $page, $search_terms, $extras ) = array_values( $post_query );

	/**
	 * Filters the AJAX query string for the component loops.
	 *
	 * @since BuddyPress 3.0.0
	 *
	 * @param string $query_string The query string we are working with.
	 * @param string $object       The type of page we are on.
	 * @param string $filter       The current object filter.
	 * @param string $scope        The current object scope.
	 * @param string $page         The current object page.
	 * @param string $search_terms The current object search terms.
	 * @param string $extras       The current object extras.
	 */
	return apply_filters( 'bp_nouveau_ajax_querystring', $query_string, $object, $filter, $scope, $page, $search_terms, $extras );
}