nginx PHP configuration

Hi,

I'd like to set up some PHP web pages using the nginx plugin.
I took the following neccessary steps (see attachments):
1) add shared folder
2) add pool
3) add server

Then I created an index.php file in the shared folder:

phpinfo();

This file is served, but sadly as plain text, the php command is not executed.
I already googled this and found some references, but none of the solutions did work for me.
Only if I enclose the script in tags like this, the PHP code is executed:

<?php phpinfo(); ?>

How can I have all .php files treated as such and omit the PHP script tags?

Thanks,
daflow

I just saw many examples omitting them. Probably all PHP files need to be tagged with them, so it was just my cluelessness
Thanks!