Description:
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If I create a file manually, named as 'v.', php can read and write it, but can't create or delete.

I'm using php -a(Interactive shell).

I tested on my server with windows 7 as well with the same results.

I also tested on cmd with admin rights as well as nt authority\system(checked with whoami).

Test script:
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php -a
fopen('v.', 'c+');//Does not work
file_put_contents('v.', 'dsdsd');//Does not work
fopen('v.v', 'c+');//works

//Manually  create a file .v with ddswd as content
echo file_get_contents('v.');//returns ddswd
file_put_contents('v.', 'kkk');//works
echo file_get_contents('v.');//returns kkk
unlink('v.');//Permission denied in php shell code on line 1
unlink('v.v');//works

//Delete the file manually than touch
touch('v.');//touch(): Unable to create file v. because Permission denied in php shell code on line 1

touch('v');//works


Expected result:
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File is created successfully, since I can create it from prompt and notepad++ without error.

Actual result:
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PHP Warning:  fopen(v.): failed to open stream: Permission denied in php shell code on line 1