How to add captcha when creating topics or leaving replies after I check the “Allow guest users without accounts to create and replies”?

I tried a few captcha plugins, they failed.
Thanks!

[@casiepa Moderator 5 years, 1 month ago]

Hi,
If you go on https://wordpress.org/plugins/search/bbpress+captcha/ it seems lots of them offer bbPress compatibility.

[@wolowe Participant 5 years, 1 month ago]

Yes, I tried many of them(don’t try reCAPTCHA-like plugins), they can work when uncheck “Allow guest users without accounts to create and replies”. They disapear when checking “Allow guest users without accounts to create and replies”.
So I want to ask if there something like add or delete some php code to solve the problem?

[@robin-w Moderator 5 years, 1 month ago]

each capcha would be specific.

Do you want to pick one that works when logged in but not when logged out, and I’ll spend 15 mins seeing if it can easily be overcome.

what version of bbpress are you using?

[@wolowe Participant 5 years, 1 month ago]

I use 2.6.2.
When using “Allow guest users without accounts to create and replies”, no need to login to post. That’s why I need captcha(maybe captchas) to try to stop the spam.