I have one bug with spider.php
 

Warning: set_time_limit() [function.set-time-limit]: Cannot set time limit in safe mode in c:\serverweb\wamp\www\Phpdig\admin\spider.php on line 22


I don't know why this error message display when the spider run.
Because Safe_mode = On into my server php.

This is not a bug: see the requirements at http://www.phpdig.net/navigation.php?action=doc#toc3 and http://www.phpdig.net/forum/showthread.php?t=1789