Laravel将动态子域重定向到文件夹

Question

我创建了具有自动创建子域功能的CMS

示例：用户按下按钮创建域，我在数据库中添加了子域名 john 并创建了文件夹 domain.com/subdomains/john.domain.com 现在我需要将此子域 john.domain.com 重定向到目录 domain.com/subdomains/john.domain.com

代码web.php：

if (!function_exists('getSubDomain')) {
    function getSubDomain($url)
    {
        $domain = $url = str_replace(Request::getRequestUri(),'', $url);
        $url = str_replace('http:','',$url);
        $url = str_replace('//','',$url);
        $url = str_replace('www.','',$url);
        $url = str_replace('domain.com','',$url);
        $url = rtrim($url,'.');
        $url = ltrim($url,'.');
        if($url){
            $user = ['john','barry','wells','cisco'];
            if(isset(array_flip($user)[$url])){
                return true;
            }
        }
        return false;
    }
}


Route::group(['domain' => '{sub}.domain.com'], function(){
    if(getSubDomain(Request::url())){

        //Here need redirect to folder.

        echo "Subdomain";
        exit;
    }
});