[PHP] How to get the system info?

In my daily work, I use Ruby, Python and PHP. In the Ruby language, we can leverage the Rubyconfig module to get the all of the system info which the Ruby Run-time Resi Des in. There is also OS and system module in the Python world to harness the system and platform information. However, it's much easier to get the same result through PHP because the PHP language offers some global constant variabl ES and built-in functions.

<?php//how to get the system Variables?echo Php_os;echo php_uname (); Echo getcwd ();/* By default, the PHP offeres some C Onstant variable, built-in function and class so we can harness to get the info we need */