No offence, but the fact is phpBB has a lot of weaknesses, not seo-friendly being one of them. However, with some simple steps you can improve the SEO of your phpBB. Here in this guide, we will add some basic SEO features to your phpBB by using a better Site Title, adding Meta Keywords and Meta Descriptions.
A guide to integrate your phpBB 3 forum’s cookie session in different folders or subdomains. Recently I looked into this matter because I need to integrate the forum’s session with my premium themes area.