获取当前协议
function get_http_type()
{
        $http_type = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')) ? 'https://' : 'http://';
        return $http_type;
} 获取当前域名
$_SERVER['HTTP_HOST']  
                    
 
                                         
                                                                                         
                                                                                         
                                                                                         
                                                                                        