Description:
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On windows, phpinfo() reports things set in the registry even though they are of 
type PHP_INI_PERDIR, so they are in fact not in effect, as documented in 
http://php.net/manual/en/configuration.changes.php. Notably upload_max_filesize 
and post_max_size are values that for example Plesk users keep hitting their heads 
with, as can be seen in these discussions:

http://stackoverflow.com/questions/11730198/php-post-max-size-local-value-
overridden-by-master-value-on-plesk-iis
http://stackoverflow.com/questions/13007906/php-upload-500-internal-server-
error/13008975

Tested on IIS 7.5 system.

Test script:
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Set post_max_size on the registry. Check phpinfo() output.

Expected result:
----------------
post_max_value not having impact on phpinfo() as it is PHP_INI_PERDIR setting and 
has no impact on PHP.

Actual result:
--------------
post_max_value updated as per registry on phpinfo() output, even though not 
effecting PHP.