Description:
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When using rename to replace an existing file, PHP on Windows incorrectly gives an access denied if the target file is read-only (0444):

An access denied error should only be given if the target file's directory permissions should keep the current user from writing to that location. Linux (tested on Ubuntu 14.04) works as expected.

Test script:
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<?php
file_put_contents('./test.txt', 'test data');
file_put_contents('./newtest.txt', 'new test data');
chmod('test.txt', 0666);
rename('newtest.txt', 'test.txt');
print "test.txt is now: " . file_get_contents('./test.txt') . "\n";

file_put_contents('./test.txt', 'test data');
file_put_contents('./newtest.txt', 'new test data');
chmod('test.txt', 0444);
rename('newtest.txt', 'test.txt');

print "test.txt is now: " . file_get_contents('./test.txt') . "\n";



Expected result:
----------------
test.txt is now: new test data
test.txt is now: new test data


Actual result:
--------------
test.txt is now: new test data

Warning:  rename(newtest.txt,test.txt): Access is denied. (code: 5) in C:\Users\Mike\Documents\dev\sandbox\sandbox.php on line 13

test.txt is now: test data