I got hacked similarly on my blog and it went undetected when my wordpress code files were changed. Now I can detect the website/server is hacked using this php

I got hacked similarly on my blog and it went undetected when my wordpress code files were changed. Now I can detect the website/server is hacked using this php code http://www.webdigi.co.uk/blog/2009/how-to-detect-if-your-webserver-is-hacked-and-get-alerted/ http://www.webdigi.co.uk/blog/2009/how-to-detect-if-your-web... (like tripwire) This helped me a couple of times and once when a hack on my wordpress blog only showed different page links to the google bot!