Elgg-Lorea-Hydra/mod/file/classes/FilePluginFile.php

<?php

/**
 * Override the ElggFile
 *
 * @note When extending an ElggEntity, one should always register a unique type/subtype
 *       combination. We failed to do so here, so get_entity() and friends will always return
 *       these objects as ElggFile. We leave it this way just for BC.
 */
class FilePluginFile extends ElggFile {
	protected function  initializeAttributes() {
		parent::initializeAttributes();

		// This should have been a unique subtype (see above)
		$this->attributes['subtype'] = "file";
	}

	public function __construct($guid = null) {
		if ($guid && !is_object($guid)) {
			// Loading entities via __construct(GUID) is deprecated, so we give it the entity row and the
			// attribute loader will finish the job. This is necessary due to not using a custom
			// subtype (see above).
			$guid = get_entity_as_row($guid);
		}
		parent::__construct($guid);
	}

	public function delete() {

		$thumbnails = array($this->thumbnail, $this->smallthumb, $this->largethumb);
		foreach ($thumbnails as $thumbnail) {
			if ($thumbnail) {
				$delfile = new ElggFile();
				$delfile->owner_guid = $this->owner_guid;
				$delfile->setFilename($thumbnail);
				$delfile->delete();
			}
		}

		return parent::delete();
	}
}