WP_REST_Revisions_Controller::get_parent( int $parent_post_id ): WP_Post|WP_Error

150	protected function get_parent( $parent_post_id ) {151		$error = new WP_Error(152			'rest_post_invalid_parent',153			__( 'Invalid post parent ID.' ),154			array( 'status' => 404 )155		);156 157		if ( (int) $parent_post_id <= 0 ) {158			return $error;159		}160 161		$parent_post = get_post( (int) $parent_post_id );162 163		if ( empty( $parent_post ) || empty( $parent_post->ID )164			|| $this->parent_post_type !== $parent_post->post_type165		) {166			return $error;167		}168 169		return $parent_post;170	}