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function unregister_post_type( $post_type ) {
	global $post_type_meta_caps, $wp_post_types;

	$post_type_object = get_post_type_object( $post_type );
	if ( ! $post_type_object ) {
		return new WP_Error( 'invalid_post_type', __( 'Invalid post type.' ) );
	}

	// Do not allow unregistering internal post types.
	if ( $post_type_object->_builtin ) {
		return new WP_Error( 'invalid_post_type', __( 'Unregistering a built-in post type is not allowed' ) );
	}

	$post_type_object->remove_supports();
	$post_type_object->remove_rewrite_rules();
	$post_type_object->unregister_meta_boxes();
	$post_type_object->remove_hooks();
	$post_type_object->unregister_taxonomies();

	unset( $wp_post_types[ $post_type ] );

	/*
	 * Rebuild the meta capabilities of the post types that remain.
	 *
	 * They are keyed by the custom capability name, so a single entry may be owed to any
	 * number of registered post types. Removing the entries for this post type alone could
	 * therefore remove entries that the others still depend on.
	 */
	$post_type_meta_caps = array();
	foreach ( $wp_post_types as $registered_post_type ) {
		if ( $registered_post_type->map_meta_cap ) {
			_post_type_meta_capabilities( get_object_vars( $registered_post_type->cap ) );
		}
	}

	/**
	 * Fires after a post type was unregistered.
	 *
	 * @since 4.5.0
	 *
	 * @param string $post_type Post type key.
	 */
	do_action( 'unregistered_post_type', $post_type );

	return true;
}