__class__ __dir__ __file__ __function__ __line__ __method__ __namespace__ __CLASS__ __DIR__ __FILE__ __FUNCTION__ __LINE__ __METHOD__ __NAMESPACE__ abstract and array as boolval break case catch cfunction class clone const continue declare default die do echo else elseif empty enddeclare endfor endforeach endif endswitch endwhile eval exit extends false final finally for foreach function global if implements include include_once instanceof interface isset list new old_function or parent print private protected public require require_once return self static switch throw true try unset var while xor