Little bug fix for is_really_writable in common.php

[eluser]Francois Gelinas[/eluser]
Hi Derek, thanks for taking time to reply to my post.
The folders that are tested with the function is_really_writable() on my system are the log and cache folders, and CI is writing and updating files in those, so it's not a permissions problem.
I updated the file with your solution :

Code:

$file = rtrim($file, '/').'/'.md5(mt_rand(1,100).mt_rand(1,100));

and could not reproduce the problem yet, so it is random enough to fix the problem.
Just one question, is there a reason to use mt_rand(1,100) twice instead of mt_rand(1,10000) ?