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I'm missing something. I have apache2 installed and I have php5 installed (both using the Install Software manager). However when I try to browse to a php file on localhost (for example http://localhost/myfolder/index.php), Firefox prompts me with "what should Firefox do with this file?"
I'm at a loss - why doesn't Firefox know how to open a php file? I browse to php files all the time on web pages, so why not on localhost?
That means the scripts aren't being parsed, just delivered as regular text files.
I reccomend using XAMPP (an easy-to-install combo of Apache/PHP/mysql)
It automatically configures everything so that it works right away.
Once it is installed if you only want to use the Apache + PHP part, you can delete the other parts =)
here is the howto