Questions about Internal named location

[heimdull]

I have a problem I can't find an answer too and I'm wondering if I'm
doing the named internal location all wrong. Here is an example of my
config

location / {
    try_files $uri $uri/ @www;
}

location @www {
    include fastcgi_params;

    fastcgi_index   index.php;
    fastcgi_param   SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_pass    myphp;
}

When I go to /index.php I get the index.php recognized as a binary file
and the browser just wants to download the file. The file that is
downloaded is correct html so I know that the file hit myphp before it
was sent to my browser.

If I add this location:

location ~ \.php$ {
     fastcgi_pass    myphp;
     fastcgi_param   SCRIPT_FILENAME
$document_root$fastcgi_script_name;
}

index.php is displayed in the browser correctly so my question is why
does the @www location not correctly handle the php file?

This all started when I tried to setup one nginx server that has
multiple php sites under one url that needs a alias for the other sites.
Something like this:

root /var/www/somesite;

location / {
    index.html index.php;
}
location /wordpress {
    alias /var/www/wordpress;
    try_files $uri $uri/ @wordpress;
}
.... 

Can anyone shed some light on how the try_files/named location works?
I'm using Nginx 0.8.36 btw

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,114926,114926#msg-114926