Over at the Fortrabbit blog you'll find a great list containing various influencers of the PHP ecosystem.
... we have to have an eye on future trends. So we are monitoring what’s going on in the open source PHP world. It’s fun watching all those interesting projects out there. But it’s not about technology only. You’ll need to know about the people driving the projects to understand what’s going on. What are the visible, vocal & visionary PHPeople up to?