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

Source

protected function get_parent( $parent_post_id ) {
	$error = new WP_Error(
		'rest_post_invalid_parent',
		__( 'Invalid post parent ID.' ),
		array( 'status' => 404 )
	);

	if ( (int) $parent_post_id <= 0 ) {
		return $error;
	}

	$parent_post = get_post( (int) $parent_post_id );

	if ( empty( $parent_post ) || empty( $parent_post->ID )
		|| $this->parent_post_type !== $parent_post->post_type
	) {
		return $error;
	}

	return $parent_post;
}

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