Description:
------------
on WinXP basename() fails if there are slashes *and* backslashes in path:

basename('foo/bla\bar') is 'bla\bar' instead of 'bar'

dirname('foo/bla\bar') is 'foo/bla' -> correct

Reproduce code:
---------------
echo basename('foo/bla/bar');
echo basename('foo\bla\bar');
echo basename('foo/bla\bar'); //this fails
echo basename('foo\bla/bar');

echo dirname('foo/bla/bar');
echo dirname('foo\bla\bar');
echo dirname('foo/bla\bar');
echo dirname('foo\bla/bar');

Expected result:
----------------
bar
bar
bla\bar
bar
foo/bla
foo\bla
foo/bla
foo\bla

Actual result:
--------------
bar
bar
bar
bar
foo/bla
foo\bla
foo/bla
foo\bla