Description:
------------
The 'mkdir' function doesn't function correctly on Windows when the pathname contain space(s) on the final. PHP returns a warning, and the directory isn't created:

Warning: mkdir() [function.mkdir]: Invalid argument in X on line Y

Temporary fix: use trim() on the pathname

Besides, if the pathname contain space(s) on the start, the directory is created when couldn't even so (in accordance with the behavior of Windows Explorer).

Reproduce code:
---------------
<?php

mkdir('pathname ');
mkdir(' pathname');

?>

Expected result:
----------------
<?php

mkdir('pathname '); // Succeeds, but trim() before, in accordance with the behavior of Windows Explorer
mkdir(' pathname'); // Succeeds, but trim() before, in accordance with the behavior of Windows Explorer

?>

Actual result:
--------------
<?php

mkdir('pathname '); // Fails
mkdir(' pathname'); // Succeeds even not being recommended

?>