dumb question about using php

["Michael Fothergill" <mikef20000@hotmail.com>]

Dear Debianists

I downloaded a small free software from the following location:

http://webscripts.softpedia.com/script/Scientific-Engineering-Ruby/Chemistry/McCabe-Thiele-Method-for-an-Ideal-Binary-Mixture-31835.html

I unzipped it and three little files appeared.

Two look like PHP files.  They have the file extension .m.

The other file is a gif file and is probably some sample graphical output.

My dumb question for the day is:


How do I call up php e.g. at a terminal window and then get it to execute 
the .m files?

Is php automatically installed in a bog standard etch desktop installation?

Comments appreciated.

Regards

Michael Fothergill

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