How to check if variable is not exist

Question

I can't find in docs how I can do negative statement like one below:

if !($some_var) {
  ... enter here if $some_var doesn't exist or empty
}

I know that I can check that the variable is exits using the if statement:

if ($some_var) {
  ...
}

But I can't find how to do if not statement

Is it possible for NGINX?

Does this answer your question? [NGINX not equal to](https://stackoverflow.com/questions/45734332/nginx-not-equal-to) — Mike Doe, Dec 22 '19 at 18:16
@emix Thank you for the link, I have already read it, but couldn't understand how to use it in my case (as I not have ~* in if statement). — Klimbo, Dec 22 '19 at 18:19

score 1 · Answer 1 · edited Jul 24 '23 at 16:43

1

Try this:


if ($var = false) {
     ....
}

edited Jul 24 '23 at 16:43

jim smith

answered Feb 17 '20 at 15:04

1 Answers1