Re: there is no option to save,create or discover any php file

OK.   When DW starts acting weird, the first thing to try is Deleting Corrupted Cache in DW

http://forums.adobe.com/thread/494811

If that doesn't help, try Restore Preferences.  Note: this will wipe out your custom settings, extensions, etc... so back up what you need.

http://helpx.adobe.com/dreamweaver/kb/restore-preferences-dreamweaver-cs4-cs5.html

If all else fails, use the CC Cleaner Tools below followed by a software re-install.

http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html

Nancy O.