bp_get_the_body_class( array $wp_classes = array(), array|bool $custom_classes = false )

	function bp_get_the_body_class( $wp_classes = array(), $custom_classes = false ) {

		$bp_classes = array();

		/* Pages *************************************************************/

		if ( is_front_page() ) {
			$bp_classes[] = 'home-page';
		}

		if ( bp_is_directory() ) {
			$bp_classes[] = 'directory';
		}

		if ( bp_is_single_item() ) {
			$bp_classes[] = 'single-item';
		}

		/* Components ********************************************************/

		if ( ! bp_is_blog_page() ) {
			if ( bp_is_user_profile() )  {
				$bp_classes[] = 'xprofile';
			}

			if ( bp_is_activity_component() ) {
				$bp_classes[] = 'activity';
			}

			if ( bp_is_blogs_component() ) {
				$bp_classes[] = 'blogs';
			}

			if ( bp_is_messages_component() ) {
				$bp_classes[] = 'messages';
			}

			if ( bp_is_friends_component() ) {
				$bp_classes[] = 'friends';
			}

			if ( bp_is_groups_component() ) {
				$bp_classes[] = 'groups';
			}

			if ( bp_is_settings_component()  ) {
				$bp_classes[] = 'settings';
			}

			if ( bp_is_invites_component() ) {
				$bp_classes[] = 'invites';
			}
		}

		/* User **************************************************************/

		if ( bp_is_user() ) {
			$bp_classes[] = 'bp-user';

			// Add current user profile types.
			if ( $member_types = bp_get_member_type( bp_displayed_user_id(), false ) ) {
				foreach( $member_types as $member_type ) {
					$bp_classes[] = sprintf( 'member-type-%s', esc_attr( $member_type ) );
				}
			}
		}

		if ( ! bp_is_directory() ) {
			if ( bp_is_user_blogs() ) {
				$bp_classes[] = 'my-blogs';
			}

			if ( bp_is_user_groups() ) {
				$bp_classes[] = 'my-groups';
			}

			if ( bp_is_user_activity() ) {
				$bp_classes[] = 'my-activity';
			}
		} else {
			if ( bp_get_current_member_type() || ( bp_is_groups_directory() && bp_get_current_group_directory_type() ) ) {
				$bp_classes[] = 'type';
			}
		}

		if ( bp_is_my_profile() ) {
			$bp_classes[] = 'my-account';
		}

		if ( bp_is_user_profile() ) {
			$bp_classes[] = 'my-profile';
		}

		if ( bp_is_user_friends() ) {
			$bp_classes[] = 'my-friends';
		}

		if ( bp_is_user_messages() ) {
			$bp_classes[] = 'my-messages';
		}

		if ( bp_is_user_recent_commments() ) {
			$bp_classes[] = 'recent-comments';
		}

		if ( bp_is_user_recent_posts() ) {
			$bp_classes[] = 'recent-posts';
		}

		if ( bp_is_user_change_avatar() ) {
			$bp_classes[] = 'change-avatar';
		}

		if ( bp_is_user_profile_edit() ) {
			$bp_classes[] = 'profile-edit';
		}

		if ( bp_is_user_friends_activity() ) {
			$bp_classes[] = 'friends-activity';
		}

		if ( bp_is_user_groups_activity() ) {
			$bp_classes[] = 'groups-activity';
		}

		/* Messages **********************************************************/

		if ( bp_is_messages_inbox() ) {
			$bp_classes[] = 'inbox';
		}

		if ( bp_is_messages_compose_screen() ) {
			$bp_classes[] = 'compose';
		}

		if ( bp_is_notices() ) {
			$bp_classes[] = 'notices';
		}

		if ( bp_is_user_friend_requests() ) {
			$bp_classes[] = 'friend-requests';
		}

		if ( bp_is_create_blog() ) {
			$bp_classes[] = 'create-blog';
		}

		/* Groups ************************************************************/

		if ( bp_is_group() ) {
			$bp_classes[] = 'group-' . groups_get_current_group()->slug;

			// Add current group types.
			if ( $group_types = bp_groups_get_group_type( bp_get_current_group_id(), false ) ) {
				foreach ( $group_types as $group_type ) {
					$bp_classes[] = sprintf( 'group-type-%s', esc_attr( $group_type ) );
				}
			}
		}

		if ( bp_is_group_leave() ) {
			$bp_classes[] = 'leave-group';
		}

		if ( bp_is_group_invites() ) {
			$bp_classes[] = 'group-invites';
		}

		if ( bp_is_group_members() ) {
			$bp_classes[] = 'group-members';
		}

		if ( bp_is_group_admin_page() ) {
			$bp_classes[] = 'group-admin';
			$bp_classes[] = bp_get_group_current_admin_tab();
		}

		if ( bp_is_group_create() ) {
			$bp_classes[] = 'group-create';
			$bp_classes[] = bp_get_groups_current_create_step();
		}

		if ( bp_is_group_home() ) {
			$bp_classes[] = 'group-home';
		}

		if ( bp_is_single_activity() ) {
			$bp_classes[] = 'activity-permalink';
		}

		/* Registration ******************************************************/

		if ( bp_is_register_page() ) {
			$bp_classes[] = 'registration';
		}

		if ( bp_is_activation_page() ) {
			$bp_classes[] = 'activation';
		}

		/* Current Component & Action ****************************************/

		if ( ! bp_is_blog_page() ) {
			$bp_classes[] = bp_current_component();
			$bp_classes[] = str_replace(',', ' ', bp_current_action());
		}

		/* Clean up ***********************************************************/

		// Add BuddyPress class if we are within a BuddyPress page.
		if ( ! bp_is_blog_page() ) {
			$bp_classes[] = 'buddypress';
		}

		// Add the theme name/id to the body classes
		$bp_classes[] = 'bp-' . bp_get_theme_compat_id();

		// Merge WP classes with BuddyPress classes and remove any duplicates.
		$classes = array_unique( array_merge( (array) $bp_classes, (array) $wp_classes ) );

		/**
		 * Filters the BuddyPress classes to be added to body_class()
		 *
		 * @since BuddyPress 1.1.0
		 *
		 * @param array $classes        Array of body classes to add.
		 * @param array $bp_classes     Array of BuddyPress-based classes.
		 * @param array $wp_classes     Array of WordPress-based classes.
		 * @param array $custom_classes Array of classes that were passed to get_body_class().
		 */
		return apply_filters( 'bp_get_the_body_class', $classes, $bp_classes, $wp_classes, $custom_classes );
	}