Description:
------------
When running php.exe from the console without any arguments (so the script can be entered directly) the constants STDIN, STDOUT, STDERR are undefined.
When running the same code trough a file (php.exe <script>) or with the php.exe -r arg the constants are defined.

Reproduce code:
---------------
<?php
var_dump(defined('STDIN'));
var_dump(defined('STDOUT'));
var_dump(defined('STDERR'));
?>
^Z


Expected result:
----------------
bool(true)
bool(true)
bool(true)

Actual result:
--------------
bool(false)
bool(false)
bool(false)