bp_version_updater()

function bp_version_updater() {

	// Get the raw database version.
	$raw_db_version = (int) bp_get_db_version_raw();

	/**
	 * Filters the default components to activate for a new install.
	 *
	 * @since BuddyPress 1.7.0
	 *
	 * @param array $value Array of default components to activate.
	 */
	$default_components = apply_filters( 'bp_new_install_default_components', array(
		'activity'      => 1,
		'members'       => 1,
		'settings'      => 1,
		'xprofile'      => 1,
		'notifications' => 1,
	) );

	$get_default_forum = bp_get_option( 'bbp_set_forum_to_default', '');
	if ( 'yes' === $get_default_forum ) {
		$default_components['forums'] = 1;
	}

	require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
	require_once( buddypress()->plugin_dir . '/bp-core/admin/bp-core-admin-schema.php' );
	$switched_to_root_blog = false;

	// Make sure the current blog is set to the root blog.
	if ( ! bp_is_root_blog() ) {
		switch_to_blog( bp_get_root_blog_id() );
		bp_register_taxonomies();

		$switched_to_root_blog = true;
	}

	// Install BP schema and activate only Activity and XProfile.
	if ( bp_is_install() ) {

		// Apply schema and set Activity and XProfile components as active.
		bp_core_install( $default_components );
		bp_update_option( 'bp-active-components', $default_components );
		bp_core_add_page_mappings( $default_components, 'delete' );
		bp_core_set_default_pages();
		bp_core_install_emails();

	// Upgrades.
	} else {

		// Run the schema install to update tables.
		bp_core_install();

		// Version 1.5.0.
		if ( $raw_db_version < 1801 ) {
			bp_update_to_1_5();
			bp_core_add_page_mappings( $default_components, 'delete' );
		}

		// Version 1.6.0.
		if ( $raw_db_version < 6067 ) {
			bp_update_to_1_6();
		}

		// Version 1.9.0.
		if ( $raw_db_version < 7553 ) {
			bp_update_to_1_9();
		}

		// Version 1.9.2.
		if ( $raw_db_version < 7731 ) {
			bp_update_to_1_9_2();
		}

		// Version 2.0.0.
		if ( $raw_db_version < 7892 ) {
			bp_update_to_2_0();
		}

		// Version 2.0.1.
		if ( $raw_db_version < 8311 ) {
			bp_update_to_2_0_1();
		}

		// Version 2.2.0.
		if ( $raw_db_version < 9181 ) {
			bp_update_to_2_2();
		}

		// Version 2.3.0.
		if ( $raw_db_version < 9615 ) {
			bp_update_to_2_3();
		}

		// Version 2.5.0.
		if ( $raw_db_version < 10440 ) {
			bp_update_to_2_5();
		}

		// Version 2.7.0.
		if ( $raw_db_version < 11105 ) {
			bp_update_to_2_7();
		}

		// Version 3.1.1
		if ( $raw_db_version < 13731 ) {
			bp_update_to_3_1_1();
		}
	}

	/* All done! *************************************************************/

	// Bump the version.
	bp_version_bump();

	if ( $switched_to_root_blog ) {
		restore_current_blog();
	}
}