Description:
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The PDO extension creates "pdo.global_value".

http://lxr.php.net/source/pecl/pdo/pdo.c#86 to #97
and
http://lxr.php.net/source/pecl/pdo/php_pdo.h#51 to #53

This global_value is picked up by the documentation as being a variable capable of being entered into the PHP.INI file.

But it is useless.

According to http://lxr.php.net/search?string=global_value

In all the places where global_value applies to INI settings, it is commented out with the exception of the PDO file.

Now, whilst this has absolutely no impact on the PDO library  it DOES mean that specific code has to exist in the documentation processing scripts to filter out this entry.

But fixing it simply involves putting some comments around the lines I've given above.