php禁用缓存

以前常提到asp禁用缓存,php怎么禁用缓存呢?基本和asp差不多,看下面代码
这是页面代码
<META HTTP-EQUIV="pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache, must-revalidate">
<META HTTP-EQUIV="expires" CONTENT="Wed, 26 Feb 1997 08:21:57 GMT">
<META HTTP-EQUIV="expires" CONTENT="0">
 这是php代码
 <?php
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
?>
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