Well I’m very proud to say I have managed to achieve it. Partly by trial and error, partly through research. I have looked at libraries/wrappers such as “Basecamp PHP API” and “HTTP class for PHP“, both have their advantages but didn’t do what I needed out-of-the-box. I have studied these guys’ code and ended with a few (< 10) lines of my own solution which currently works. 100%. Bulletproof. I say currently because I suspect it might not be intended functionality of the authentication script. But I am also hoping that by the time 37 signals (Basecamp development team) change/disable it they will either PROPERLY describe how to achieve so (using PHP, no cURL and without using OpenID – which not everybody has).

Slightly hesitant to publish the solution not to bring Basecamp’s attention to it, but since I know there are LOADS of people looking for the solution I will tell you how. All I’m after is enough (say 25+) comments here requesting the functionality. Only then I will share. Promise!

It is surprisingly easy, the only clue I’ll give you for now is to study the headers the login form sends and follow the redirections.

Demo will follow soon!