<?php      define("_cachepath_","./cache/");      define("_cacheenable_","1");      define("_recachetime_","43200");      include('cache.php');      $cache=new cache();      if ($cache->check()) {          $template=$cache->read();      }else {          ob_start();          ob_implicit_flush(0);  ?>  页面内容。。。。  <?php      $template = ob_get_contents();      $cache->write($template);  }  ?>