Fix some bugs in PHP App

I need two bugs fixed in this php app: [login to view URL] that need to be fixed asap. * Autolinking of URL's doesn't always work. The user can enter a URL and when their message is posted the URL will be autolinked. However, it doesn't work with subdomains. This needs to be fixed. The url's also don't get properly displayed on certain pages. * User keeps getting logged out. Their is an issue with the cookies which causes the user to keep getting logged out. The user needs to remain logged in until they choose to log out. More work will be offered on an ongoing basis on this project if you want it.