Description:
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In PHP 5.3, and of course all version before it, Windows 7 is detected as 6.2, which would be Windows 8, which isn't released. So Windows 7, as 6.1 will turn into Unknow Windows version.(It's also should be Unknown, not Unknow).

Test script:
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<?php
echo php_uname('v');


Expected result:
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build 7601 (Windows 7 Ultimate Edition Service Pack 1)

This is from my patch.

Actual result:
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build 7601 (Unknow Windows version Ultimate Edition Service Pack 1)