Browser does not update after php modification

The browser does not update after php is modified

1. Reason 1: PHP has set a cache

If this problem exists in php files, it should be in the php5 version. In the php.ini file, the value of opcache.revalidate_freq is set by default. Set to 0, which can solve the php cache problem.

2. Reason 2: Browser cache

a) When accessing the url, you can add some parameters such as:? xxx=123, so that the browser will re-obtain the data

b) PHP script file settings header

//禁止页面缓存
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");//内容过期时间 强制浏览器去服务器去获取数据 而不是从缓存中读取数据
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");//标记内容最后修改时间
header("Cache-Control: no-store, no-cache, must-revalidate");//强制不缓存
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");//禁止本页被缓存
header("Access-Control-Allow-Origin: *"); // Support CORS

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