@JohnConde, do you recognize this as Hack (hacklang.org)? I'm new to both, so I might be mistaken about the language. But I'm not mistaken about the syntax.
– solimantSep 23 '16 at 06:21
@JohnConde this is not a duplicate of the linked question.
– Sep 23 '16 at 09:01
2
@bigT since this has been incorrectly closed as a duplicate, I can't submit this as an answer.
The operator is the [null safe](https://docs.hhvm.com/hack/operators/null-safe) operator. If `$foo` is `null`, then `null` is returned. Otherwise, it acts as the normal object access operator.
– Sep 23 '16 at 09:02
@simon_w This was *correctly* marked as a dupe when it was closed because the OP marked this as a PHP question. All PHP questions relation to symbols are dupes of the question above. Since the question has been clarified this can be reopened.
– John CondeSep 23 '16 at 10:49
@simon_w, you are right, this is Hack indeed. Are you able to submit answer now? Please do, and I'll mark it as accepted.
– solimantSep 23 '16 at 17:09
I voted to reopen but we still need two votes for it to reopen. I don't know why I couldn't do so automatically. I guess they changed something that prevents that now.
– John CondeSep 23 '16 at 17:34
Strange.. It says on your PHP badge "Users with the PHP badge can single-handedly close PHP questions as duplicates and reopen them as needed."
– solimantSep 23 '16 at 18:07