What is a good free web host that supports PHP & mySQL?

So I'm looking for a good web host (obviously). I'm currently using HelioHost, but I can't say I'm entirely satisfied. Plenty of space for what I'm using it for, but it's rather unreliable imo. Most of the time a visitor views my ONLY page on HelioHost, it doesn't load 75% of the time. So I just want a better candidate. I'm not concerned with space, I only need it for guestbook entries, but it does need to have PHP and SQL support. And I'm looking for something free of course.