How to clear browser cache in php?

青灯夜游
Release: 2023-03-04 22:02:01
Original
4132 people have browsed it

PHP uses "header("Last-Modified:".gmdate( "D,d M Y H:i:s") . "GMT");header("Cache-Control:no-cache,must- revalidate");" to clear the cache.

How to clear browser cache in php?

Recommended: "PHP Video Tutorial"

php clear browser cache

I encountered a small problem during the development process today. I modified the cover of a book in the background. After uploading the image, due to the cache of the browser, after the modification, the original cover was still displayed in the background. Later, Added two lines of code to solve this problem.

header("Last-Modified: " . gmdate( "D, d M Y H:i:s" ) . "GMT" );  
header("Cache-Control: no-cache, must-revalidate" );
Copy after login

Description:

header() function sends the original HTTP header to the client.

It is important to realize that the header() function must be called before any actual output is sent

Syntax

header(string,replace,http_response_code)
Copy after login

How to clear browser cache in php?

7 ways to use PHP header

1. Jump to page
header('Location:'.$url);  //Location和":"之间无空格。
Copy after login
2. Declare content-type
header('content-type:text/html;charset=utf-8');
Copy after login
3. Return response status code
header('HTTP/1.1 404 Not Found');
Copy after login
4. Execute jump after a certain time
header('Refresh: 10; url=http://www.baidu.com/');  //10s后跳转。
Copy after login
5. Control browser cache
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-cache, must-revalidate");
header("Pragma: no-cache");
Copy after login
6. .Perform http verification
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Basic realm="Top Secret"');
Copy after login
7. Perform download operation
header('Content-Type: application/octet-stream'); //设置内容类型
header('Content-Disposition: attachment; filename="example.zip"'); //设置MIME用户作为附件
header('Content-Transfer-Encoding: binary'); //设置传输方式
header('Content-Length: '.filesize('example.zip')); //设置内容长度
Copy after login

For more programming-related knowledge, please visit: Introduction to Programming! !

The above is the detailed content of How to clear browser cache in php?. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
php
source:php.cn
Statement of this Website
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
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template