PHP code introduction to disable page caching_PHP tutorial

The code to disable page caching in php is quite simple. Just use the php header() browser to send a Cache-Control: no-cache or set the page cache expiration time to before today.

A friend said the following is the simplest way to disable page caching

代码如下	复制代码
header("Cache-Control: no-cache, must-revalidate");

Here I will first give you a piece of php code that can be used:

The code is as follows

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


Let’s first understand the HTTP response message. In fact, we can use the Telnet command to view it. Below I will give some HTTP response content: HTTP/1.1 200 OK

Server:Microsoft-IIS/6.0

Date: Thu, 31 Oct 2008 11:20:53 GMT

Content-Type: text/html

Set-Cookie: name=value; path=/

代码如下	复制代码
//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");

Cache-control: private

Let’s introduce it in detail below.

The code is as follows

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//Set the expiration time of this page (expressed in Greenwich Mean Time), as long as it is a date that has passed.  header("Expires: Mon, 26 Jul 1970 05:00:00 GMT");   //Set the last updated date of this page (expressed in Greenwich Mean Time) to the current day to force the browser to obtain the latest information. header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");   //Tell the client browser not to use cache, HTTP 1.1 protocol header("Cache-Control: no-cache, must-revalidate");  //Tell the client browser not to use cache and be compatible with HTTP 1.0 protocol header("Pragma: no-cache");