server_name www.test.com bbs.test.com blog.test.com;
index index.html index.htm index.php;
root /www/test.com;



#申明sub_domain变量
set sub_domain "";
#正则提取出二级域名
if (http_host ~ "(.+).test.com") {
    #把二级域名赋值给sub_domain变量
    setsub_domain 1;
}

if (sub_domain = "www") {
    set sub_domain "";
}

if (sub_domain = "bbs") {
    rewrite /(.+) /sub_domain/1 last;
}

if (sub_domain = "blog") {
    #设置rewrite规则
    rewrite ^(.*) /sub_domain/index.php?s=1 last;
}