get_post_ancestors( int|WP_Post $post ): int[]

1137function get_post_ancestors( $post ) {1138	$post = get_post( $post );1139 1140	if ( ! $post || empty( $post->post_parent ) || $post->post_parent === $post->ID ) {1141		return array();1142	}1143 1144	$ancestors = array();1145 1146	$id          = $post->post_parent;1147	$ancestors[] = $id;1148 1149	while ( $ancestor = get_post( $id ) ) {1150		// Loop detection: If the ancestor has been seen before, break.1151		if ( empty( $ancestor->post_parent ) || $ancestor->post_parent === $post->ID1152			|| in_array( $ancestor->post_parent, $ancestors, true )1153		) {1154			break;1155		}1156 1157		$id          = $ancestor->post_parent;1158		$ancestors[] = $id;1159	}1160 1161	return $ancestors;1162}