nginx.conf

user              www;
worker_processes  4;
error_log         logs/error.log;
pid               temp/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include            mime.types;
    default_type       application/octet-stream;
    sendfile           on;
    keepalive_timeout  65;
    gzip               on;
    server {
        listen      80;
        server_name localhost;
        root        /Users/username/Develop/Sites/localhost;
        index       index.php;

        sendfile on;
        keepalive_timeout 15;
        charset utf-8;

        location / {
            if (-f $request_filename) {
                break;
            }

            rewrite  ^ /index.php  last;
        }

       location ~ \.php$ {
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            include        fastcgi_params;
        }

        location ~ /\.ht {
            deny all;
        }
    }

    server {
        listen      80 default;
        server_name _;
        root        /Users/username/Develop/Sites/$host/web;
        index       index.php;

        sendfile on;
        keepalive_timeout 15;
        charset utf-8;

        location / {
            if (-f $request_filename) {
                break;
            }

            if (!-d /Users/username/Develop/Sites/$host/web) {
                rewrite ^ localhost;
            }

            rewrite  ^ /index.php  last;
        }

       location ~ \.php$ {
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            include        fastcgi_params;
        }

        location ~ /\.ht {
            deny all;
        }
    }
}