This is actually the best possible thing to happen for you as a zerg player. He's running just Phoenixes and he has given you map control FOR FREE.
Your Strategy is going to be as follows:
- Build a couple spore to stop early Phoenix harass.
- Expand to 3 or 4 bases
- Spread your creep
- Build pretty much any unit, you're going to run over him
He's giving up the Macro advantage as you now have map control. You can build Hydras as a direct counter to Phoenix and they have the nice benefit of being strong against 4 gate.
Now if he pushes out a more standard 4 Warpgate play, you just FE and play normal vs a 2 Base Protoss. By the time you make a serious push, the Photon Cannons will be a small factor.
Btw, what do people feel about the plural of Phoenix? In Roman mythology there was only one Phoenix in the entire world so the word had no plural. I've been using it as both plural and singular (like fish) as a result.