PHP4 And GPL mixing, what is linking?

[James Michael DuPont <mdupont777@yahoo.com>]

Dear all,

Is it possible to make a GPL'ed PHP4 software and distribute it? 
Does the not depend on the Zend API

Is it possible to make a non-free plugin for a GPL'ed PHP4?

Where does linking occur? Can I prevent non-free software from using a
GPLEd with a strong dependency? 

What about SQL database, can I prevent non-free software from using the
database of a GPled application?

see this thread : 
http://mail.gnu.org/archive/html/savannah-hackers/2002-09/msg00414.html

Thanks,
mike

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James Michael DuPont
http://introspector.sourceforge.net/

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