DevShed is the first ever forum I have joined. It was in my first days as a trainee web developer. It didn't take more than 30 minutes in my very first day at work as a developer to understand my basic knowledge of PHP and MYsql was not enough for projects at office. I didn't want to ask anyone so was keep searching in Google till I found Devshed and couple of other php forums.
I have learned a lot about PHP from that forum. Still I think it's the best forum for PHP. Funny thing is my post count there is less than 200 posts and that for 8 or 9 years !