Forgive the top-post.

I tried the php -I found php was looking for the php.ini in /var/www/conf.
I copied php.ini from /etc/ to /var/www/conf. Now the shell_exec works fine.

Thanks Jason. 

If I wanted to use exec() for this project in the future, is:

(shell_exec ("free -b")) = (exec("free -b", $data ,$result_code)) 

I tried using exec as 
exec("free -b", $data ,$result_code)); 
but I didn't get the $data I was expecting. Are my variables mixed up?

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