location ~ .php$ {

         root          /home/www;

         fastcgi_pass   127.0.0.1:9000;

         fastcgi_index  index.php;

         fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;

         include fastcgi_params;

     }

 $document_root 等于 root

 可写为：        fastcgi_param  SCRIPT_FILENAME  home/www$fastcgi_script_name;