一个php禁止页面缓存的函数

<?php
function nocache_headers() {
@ header('Expires: Thu, 01 Jan 1970 00:00:01 GMT');
@ header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
@ header('Cache-Control: no-cache, must-revalidate, max-age=0');
@ header('Pragma: no-cache');
}
nocache_headers();
?>

<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">

response.expires=0
response.addHeader("pragma","no-cache")
response.addHeader("Cache-Control","no-cache, must-revalidate")

header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");

response.addHeader("Cache-Control", "no-cache");
response.addHeader("Expires", "Thu, 01 Jan 1970 00:00:01 GMT");

<?php  
 
//设置此页面的过期时间(用格林威治时间表示)，只要是已经过去的日期即可。  
header("Expires: Mon, 26 Jul 1970 05:00:00 GMT");    
 
//设置此页面的最后更新日期(用格林威治时间表示)为当天，可以强制浏览器获取最新资料   
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");    
 
//告诉客户端浏览器不使用缓存，HTTP 1.1 协议   
header("Cache-Control: no-cache, must-revalidate");    
 
//告诉客户端浏览器不使用缓存，兼容HTTP 1.0 协议   
header("Pragma: no-cache");  
?>