WordPress城市前缀以url作为子域和子页面

Question

我如何将其添加到wordpress中，我创建该子域，此子域的文件夹与 site.com 我的主页上有用于获取子域名的代码

preg_match('/([^.]+)\.site\.com/', $_SERVER['SERVER_NAME'], $matches);
if(isset($matches[1])) {
    $subdomain = $matches[1];
}
if($subdomain=="cityname"){
    echo "Welcome to".$cityname ;
}else{ echo "Welcome to default city";}

如果任何用户输入

，我需要为htaccess添加规则

$citynameprefix= array("new-york","LA","Boston","London");
foreach($citynameprefix as $cityprefix){
    $cityprefix.site.com/page
    site.com/cityprefix/page
}

cityname.site.com/page = site.com/cityname/page

cityname.site.com/cityname/ = 404未找到