How to use header() in php to disable caching

How to use header() to disable caching in php: 1. Use header() to set the expiration time; 2. Use header() to set the last updated date of the page to today, which can force the browser to obtain the latest information; 3. , use header() to tell the client browser not to use caching.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php prohibits the browser from using cached pages

This can be achieved by sending a specific cache control original HTTP header through PHP's header() function. The specific code is as follows:

<?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");   
  
?>

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