Description:
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Absolute symbolic links for local drives created in a standard cmd shell without drive letter using mklink are not followed in PHP.  For instance, in cmd, "mklink /d c:\tmp\windows \windows" creates a symbolic link (directory) to c:\windows.
In PHP, is_dir('c:/tmp/windows') returns false.  is_link('c:/tmp/windows') returns true.  readlink('c:/tmp/windows') returns "c:/windows". is_dir('/windows') returns true.

If the link is created with the drive letter, is_dir/is_file returns true.
This seems like an inconsistency given that is_file/is_dir recognize absolute paths to files/directories that do not include the drive letter.

Test script:
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Windows cmd shell without drive letter:
mkdir c:\tmp
mklink /d c:\tmp\windows \windows
PHP interactive CLI (php -a):
is_dir('c:/tmp/windows') == true //false
is_dir('/windows') == true //true
readlink('c:/tmp/windows') == 'c:\windows' //true



Windows cmd shell with drive letter:
mkdir c:\tmp
mklink /d c:\tmp\windows c:\windows
PHP interactive CLI (php -a):
is_dir('c:/tmp/windows') == true //true
is_dir('/windows') == true //true
readlink('c:/tmp/windows') == 'c:\windows' //true