配置varnish 批量刷新缓存，

参考 ：https://www.varnish-cache.org/docs/3.0/tutorial/purging.html?highlight=ban 在sub vcl_recv 中添加 if (req.request == "BAN") {          if (!client.ip ~purge){                  error 405 "Not allowed";          }  ban("req.http.host == " +req.http.host+" && req.url ~ "+req.url);  error 200 "Ban added"; } php，刷新函数 function ban($ip,$host, $uri) {     $errstr = '';     $errno = '';     $fp = fsockopen ($ip, 80, $errno, $errstr, 2);     if (!$fp)     {          return false;     }     else     {         $out = "BAN $url HTTP/1.1\r\n";         $out .= "Host:$host\r\n";         $out .= "Connection: close\r\n\r\n";         fputs ($fp, $out); while (!feof($fp))   {    $out = fgets($fp,4096);   }           fclose ($fp);          return true;     } }

uri可以是目录 ("/"结尾)，也可以匹配正则，（如 .*\.png）