How do I access the value of PHP_OS?

[David Scott <dscott@xxxxxxxxxxxxxxxxxxx>]

In the PHP on Windows chapter of Programming PHP, there is mention of a 
constant, PHP_OS, that can be used to determine the OS running the 
server that PHP is on.

The example code is as follows,

<?php
 if (PHP_OS == "WIN32" || PHP_OS == "WINNT") {
   define("INCLUDE_DIR","c:\\myapps");
 } else {
   // some other platform
   define("INCLUDE_DIR", "/include");
 }
?>

However, rather than checking this value, I'd like to see if flat out. I 
tried this,

<?php
     echo "PHP_OS";
?>

But it didn't work. How can I see the value contained in this constant?

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