Description:
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realpath() changed its return value, that returns full path without directory separator even the argument has.

EX:
Argument: './'
In 5.2.6: 'c:\abc'
In 5.2.5: 'c:\abc\'

Argument: '.'
In 5.2.6: 'c:\abc'
In 5.2.5: 'c:\abc'

I had tested on both Windows Vista and Windows 2003 Server.

Reproduce code:
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php -r "echo realpath('./');"

Expected result:
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'c:\abc\'

Actual result:
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'c:\abc'