It's been extinct since the mid-80's, no matter what anyone tells you.

All PH was a 100% sativa strain that happened to be purple, and from what I've heard and read, it wasn't even that potent.

There are hundreds of other kinds of purple colored, or tinted purple/blue strains out there that knock PH out the water.

Purple Power
Blueberry
Rockbud

Are just a few examples.

Purple Haze is gone people. Finding a 100% sativa strain these days are a near to impossible mission, let alone one that is purple.