[PHP] What is the PATH...

When PHP try to execute a program via exec() or system(), where does it search for it? I mean, it sertainly is not MY (foo.php owner) path, because it returns me a sh: YOUR_PROGRAM: command not found It seems to be (/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin ) now. Where can I set this

[PHP] what exactly are /path/to/blah looking for? .h? .so? .a? what?!

I'm having difficulties with that line: ./configure --with-openlink=/path/to/openlink/ --with-iodbc=/path/to/iodbc/ so I've tried every combination I can think of related to "iodbc" and "openlink", and none of these are compiling. Every one results in "No such file or directory"!