织梦DEDECMS如何自动更新首页

<?php
set_time_limit(0);
//你网站的CMS根网址，结束不要加 /
$baseCmsUrl = "http://www.examx.cn";
//动态主页的名称
$dmPageName = "index.php";
//静态主页的名称
$stPageName = "index.html";
//你希望多长时间更新一次，单位是秒
$mkTime = 3600;
//下面是执行的代码
$tureStFile = dirname(__FILE__).&#39;/&#39;.$stPageName;
$ftime = @filemtime($tureStFile);
if(!file_exists($tureStFile) || ($ftime < time()-$mkTime))
{
$body = file_get_contents($baseCmsUrl.&#39;/&#39;.$dmPageName);
$fp = fopen($tureStFile, &#39;w&#39;);
fwrite($fp, $body);
fclose($fp);
}
?>

<script language=&#39;javascript&#39; src=&#39;task.php&#39;></script>