gistfile1.txt

<?php
/**
 * WordPress Post Extended Transformer Class file for the ActivityPub WordPress plugim.
 *
 * There is a massive problem with this approach. I just locked all other plugins out
 * from ever doing something similar. The WordPress way is to supply a filter.
 */
namespace Activitypub\Transformer;

class MoreTags extends Post {
	protected function get_tag() {
		if ( false !== $this->tags ) {
			return $this->tags;
		}

		$tags = parent::get_tag();
		
		// I'm honestly surprised this was not in core
		$tags = apply_filters( 'activitypub_post_tags', $tags, $this->item);
		
		$this->tags = \array_unique( $tags, SORT_REGULAR );

		return $this->tags;
	}
}