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PhabricatorFlagDestructionEngineExtension.php
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			<?php

			final class PhabricatorFlagDestructionEngineExtension
			extends PhabricatorDestructionEngineExtension {

			const EXTENSIONKEY = 'flags';

			public function getExtensionName() {
			return pht('Flags');
			}

			public function destroyObject(
			PhabricatorDestructionEngine $engine,
			$object) {

			$object_phid = $object->getPHID();

			if ($object instanceof PhabricatorFlaggableInterface) {
			$flags = id(new PhabricatorFlag())->loadAllWhere(
			'objectPHID = %s',
			$object_phid);
			foreach ($flags as $flag) {
			$flag->delete();
			}
			}

			$flags = id(new PhabricatorFlag())->loadAllWhere(
			'ownerPHID = %s',
			$object_phid);
			foreach ($flags as $flag) {
			$flag->delete();
			}
			}

			}