Prior to 5.3 (really long time ago), GC could not collect self-referencing objects. http://php.net/manual/en/features.gc.performance-considerations.php http://p

Prior to 5.3 (really long time ago), GC could not collect self-referencing objects. http://php.net/manual/en/features.gc.performance-considerations.php http://php.net/manual/en/features.gc.performance-considerati... After circular-reference cleanup has been implemented, php should work no different than any ohter GC language. I personally had some scrapers running for days with no issues.