How to set page expiration in php

php method to set page expiration: first open the corresponding PHP page file; then pass [header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT" );] method to set page expiration.

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PHP settings page expired

Today I encountered the problem of setting the expiration of PHP pages. Some pages have expired before, and some have not expired. Delete the HTML code about expiration in the page, and use the following code to uniformly control the expiration of the form page submitted under IE. Situation

PHP settings page expires

header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");

PHP settings page does not expire

session_cache_limiter('private,must-revalidate');

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