[PHP] Test the server.

[Vincent M.]

Hello,

Is there anyway to check these two things:
 - If the server is an Unix server.
 - If a command is available on the server.
For exemple, I need to test if the shell command unzip is avalaible to do:
exec("unzip ...something...") ;
So I can test if exec is available doing:
if(function_exists(exec)) {
  ...
}
But how to test if a shell command is available on the server and if the 
server is an Unix-like server ?

Thanks.

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