Description:
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Just a little correction, Example #1 (of reserved.variables.environment.php manual page) would't proceduce any output because the "user" enviroment variable must be "USER".

So the example must be: 

<?php
echo 'My username is ' .$_ENV["USER"] . '!';
?>



Expected result:
----------------
Print: My username is SOMEUSER!

Actual result:
--------------
Print: My username is !