PHP uses header to set browser cache

The function of the header() function is to send a raw HTTP header [Http Header] to the client.
The header is a string sent by the server before transmitting HTML data to the browser using the HTTP protocol. A blank line is required between the header
and the HTML file. Now let me share with you a PHP technology that uses headers to set browser cache.

 time() ){ header("HTTP/1.1 304"); exit; } //发送Last-Modified头标，设置文档的最后的更新日期。 header ("Last-Modified: " .gmdate("D, d M Y H:i:s", time() )." GMT"); //发送Expires头标，设置当前缓存的文档过期时间，GMT格式，我们使用的是GMT+8时区 header ("Expires: " .gmdate("D, d M Y H:i:s", time()+$cache_time )." GMT"); //发送Cache_Control头标，设置xx秒以后文档过时,可以代替Expires，如果同时出现，max-age优先。 header ("Cache-Control: max-age=$cache_time"); echo time(); ?>

About using the header() function. I still have a lot of knowledge points for you. Next, the editor will continue to share with you the usage of the PHP header function and its precautions.

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