Home  >  Article  >  Backend Development  >  Cacheable Dynamic Web Design in PHP Squid_PHP Tutorial

Cacheable Dynamic Web Design in PHP Squid_PHP Tutorial

WBOY
WBOYOriginal
2016-07-21 15:49:19964browse

Of course, the prerequisite is to turn on a function reload_into_ims on in the CDN first. In this way, users will not be afraid of sending no-cache. Because this will convert the no-cache into If-Modified-Since. So we write the program mainly for If-Modified -Since control is fine. Remember, in the cache system architecture, it is best to be controlled by the backend, so the best way is to manage expiration by program. Hehe, I only know PHP, so I will use PHP to write one. The same goes for the program
See my program below, haha, it expires in 5 minutes.
$headers = apache_request_headers();
$client_time = (isset($headers['If- Modified-Since']) ? strtotime($headers['If-Modified-Since']) : 0);
$now=gmmktime();
$now_list=gmmktime()-60*5;
if ($client_time<$now and $client_time >$now_list){
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $client_time).' GMT' , true, 304);
exit(0);
}else{
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $now).' GMT', true, 200);
}
?>

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/319554.htmlTechArticleOf course, the prerequisite is to turn on a function reload_into_ims on in the CDN. In this way, users will not be afraid of sending no-cache. Because this will convert no-cache into If-Modified-Since. So we write the main program...
Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn