php不同运行模式(sapi)下清空内存缓冲池提前返回结果的实现

 if (PHP_SAPI == 'cgi-fcgi') {
     echo $response;
     fastcgi_finish_request();
     } elseif (PHP_SAPI == 'apache2handler') {
      header("Connection: close\r\n");
      header('Content-Encoding: none\r\n');
      echo $response;
      $size = ob_get_length();
      header("Content-Length: " . $size . "\r\n");
      // send info immediately and close connection
      ob_end_flush();
      flush();
      ob_flush();
 }