php禁止浏览器使用缓存页面的方法
php禁止浏览器使用缓存页面的方法
页面缓存在有的时候是不需要的,我们可以禁止浏览器缓存页面。
在PHP中可以轻松的使用下面的语句实现禁止页面缓存,但比较难记特整理下,方便大家使用。
php代码如下:
代码如下:
// 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 " );
?>
这对于某些页面来说是很有用的,例如:单信息以及订单下的商品,并且清空购物车对应商品数据。
肯定不希望用户到了最后一个页面,都已经生成订单了,再点浏览器的返回按钮回到前一个页面。
那么在订单地址页面加入:
代码如下:
header("Cache-Control:no-cache,must-revalidate,no-store"); //这个no-store加了之后,Firefox下有效
header("Pragma:no-cache");
header("Expires:-1");
这个页面不缓存了,并且有个判断购物车商品为空就跳转到空购物车的页面,那么用户点击浏览器后退,回来之后,也直接到 购物车页面了。

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