PHP variable into Perl

I have an old PGP encryption Perl script that works well.
How can I send PHP $ variables into my Perl script ?

Thanks,
Peter

If you've got Perl running on the server, why not use capture its output using fopen against the .pl URL?

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I don't quite get it :
why not use capture its output using fopen against the .pl URL?

So I have several $ variables from my PHP script that I want to pass onto my Perl script ! Do you mean: open/fopen the Perl script ?