PPR means, quite simply, that you phone before you go.
If they say "Sure, come on over", or ask for your details, or are surprised that you bothered at all - then no problem.
Some places I've phoned have asked for details, such as number of hours, ratings, experience and so on, and then given me a number to use on the radio call.
Then there's that airfield that asked pilot's name, and on being told said "YOU aren't coming in here, chum!" [Hi, Chilli
]
I recall there used to be another category called
PPO which was a sort of aggressive PPR, but I haven't seen that lately. Perhaps it was a feature of a different flight guide.