bp_core_admin_components_activation_handler()

function bp_core_admin_components_activation_handler() {

    if ( ! isset( $_GET['bp_component'] ) ) {
	    return;
    }

	// Bail if nonce fails.
	if ( ! check_admin_referer( 'bp-admin-component-activation' ) )
		return;

	// Settings form submitted, now save the settings. First, set active components.
	if ( isset( $_GET['bp_component'] ) ) {

		// Load up BuddyPress.
		$bp = buddypress();

		// Save settings and upgrade schema.
		require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
		require_once( $bp->plugin_dir . '/bp-core/admin/bp-core-admin-schema.php' );

		$current_action = 'active';
		if ( isset( $_GET['do_action'] ) && in_array( $_GET['do_action'], array( 'activate', 'deactivate' ) ) ) {
			$current_action = $_GET['do_action'];
		}

		$current_components = $bp->active_components;

		$submitted = stripslashes_deep( $_GET['bp_component'] );

		switch ( $current_action ) {
			case 'deactivate' :
			    foreach( $current_components as $key => $component ) {
			        if ( $submitted == $key ) {
				        unset( $current_components[ $key ] );
			        }
                }
				$bp->active_components = $current_components;
				break;

			case 'activate' :
			default :
			    $bp->active_components = array_merge( array( $submitted => $current_action == 'activate' ? '1' : '0' ), $current_components );
				break;
		}

		$uninstalled_components = array_diff_key($current_components, $bp->active_components);

		bp_core_install( $bp->active_components );
		bp_core_add_page_mappings( $bp->active_components );
		bp_update_option( 'bp-active-components', $bp->active_components );

		bp_core_uninstall( $uninstalled_components );
	}

	// Assign the Forum Page to forum component.
	if ( array_key_exists( 'forums', $bp->active_components ) ) {
		$option = bp_get_option('_bbp_root_slug_custom_slug', '' );
		if ( '' === $option ) {
			$default_title = bp_core_get_directory_page_default_titles();
			$title         = ( isset( $default_title[ 'new_forums_page' ] ) ) ? $default_title[ 'new_forums_page' ] : '';

			$new_page = array(
				'post_title'     => $title,
				'post_status'    => 'publish',
				'post_author'    => bp_loggedin_user_id(),
				'post_type'      => 'page',
				'comment_status' => 'closed',
				'ping_status'    => 'closed',
			);

			$page_id                    = wp_insert_post( $new_page );

			bp_update_option('_bbp_root_slug_custom_slug', $page_id );
			$slug = get_post_field( 'post_name', $page_id );
			bp_update_option('_bbp_root_slug', $slug);
		}
	}

	$current_action = 'all';
	if ( isset( $_GET['action'] ) && in_array( $_GET['action'], array( 'active', 'inactive' ) ) ) {
		$current_action = $_GET['action'];
	}

	// Where are we redirecting to?
	$base_url = bp_get_admin_url( add_query_arg( array( 'page' => 'bp-components', 'action' => $current_action, 'updated' => 'true', 'added' => 'true' ), 'admin.php' ) );

	// Redirect.
	wp_redirect( $base_url );
	die();
}