网站的目录结构为：

# tree /home/wwwroot/exehack.net
/home/wwwroot/exehack.net
├── bbs
│ └── index.html
└── www
└── index.html
2 directories, 2 files

/home/wwwroot/exehack.net为nginx的安装目录下默认的存放源代码的路径。
bbs为论坛程序源代码路径；www为主页程序源代码路径；把相应程序放入上面的路径通过；http:// *.domain.com;

if ($host ~* ^([^\.]+)\.([^\.]+\.[^\.]+)$) {
set $subdomain $1;
set $domain $2;
}

location / {
root /home/wwwroot/$domain/$subdomain/;
index index.php index.html index.htm;
#include /home/wwwroot/$domain/$subdomain/.ngx.htaccess;
}

error_page 500 502 503 504 /50x.html;

location = /50x.html {
root html;
}

location ~ \.php$ {
root /home/wwwroot/$domain/$subdomain/;
fastcgi_pass 127.0.0.1:9100;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
}