def self.keywords
@keywords ||= Set.new %w(
and E_PARSE old_function E_ERROR or as E_WARNING parent eval
PHP_OS break exit case extends PHP_VERSION cfunction FALSE
print for require continue foreach require_once declare return
default static do switch die stdClass echo else TRUE elseif
var empty if xor enddeclare include virtual endfor include_once
while endforeach global __FILE__ endif list __LINE__ endswitch
new __sleep endwhile not array __wakeup E_ALL NULL final
php_user_filter interface implements public private protected
abstract clone try catch throw this use namespace yield
)
end