1--TEST-- 2timezone object reference handling 3--FILE-- 4<?php 5date_default_timezone_set('UTC'); 6$dto = new DateTime(); 7$tzold = $dto->getTimezone(); 8var_dump($tzold->getName()); 9$dto->setTimezone(new DateTimeZone('US/Eastern')); 10var_dump($tzold->getName()); 11var_dump($dto->getTimezone()->getName()); 12unset($dto); 13var_dump($tzold->getName()); 14echo "Done\n"; 15?> 16--EXPECT-- 17string(3) "UTC" 18string(3) "UTC" 19string(10) "US/Eastern" 20string(3) "UTC" 21Done 22