How to enable Nginx to serve PHP code/pages in Ubuntu

[Roxis]

On Tuesday 04 November 2008, Edho P Arief wrote:
> I'm also waiting for the day it's merged with PHP core but currently
> it's the one of the best way to spawn and manage php-fcgi processes,
> the other (not as good as using php-fpm) is using spawn-fcgi provided
> by lighttpd (explained here
> http://wiki.codemongers.com/NginxFcgiExample )

Wha's the big deal about spawn-fcgi?
Why is i better than an one-liner shell script?