Why is the php page not updated in time? How to deal with it?

PHP is a programming language widely used in website development and has good flexibility and development efficiency. However, after using PHP to optimize the page, you may encounter a very troublesome problem, that is, "the PHP page is not updated in time." Regarding this issue, this article will provide you with a detailed analysis from the following aspects.

1. What causes the PHP page to not be updated in time?

1. Browser cache

Browser cache is a way to improve the loading speed of web pages, but it will cause the page to not be updated in time. Especially for static resources, such as CSS and JS, the browser will store them in the cache to improve web page loading speed. When you make modifications to these resources, the page will not be updated immediately due to browser cache.

2.PHP cache

PHP has its own running cache, which can reduce the server's response time and CPU load. But this also results in the page not being reflected immediately after updating.

3. Proxy cache

There may be proxy servers behind the Web server. They are responsible for caching the information of the requested site to improve network speed, but this may also cause the modified information to not be available immediately. reflect.

2. How to solve the problem of PHP pages not being updated in time?

1. Clear the browser cache

You can manually clear the browser cache. The operation methods are different in different browsers. Generally, you can find it in the settings options. Additionally, for older versions of Internet Explorer, the way to clear the cache is through the Internet Options menu.

2. Change PHP cache

The caching mechanism can be set in the PHP.ini file. You can turn off the PHP cache by setting the "output_buffering" option in the file to "Off".

3. Disable proxy cache

Disable proxy cache in the .htaccess file. Add the following code:

<FilesMatch ".(html|htm|xml|txt|xsl)$">
Header set Cache-Control "max-age=0, no-cache, no-store, must-revalidate"
Header set Pragma "no-cache"
Header set Expires "Wed, 11 Jan 1984 05:00:00 GMT"
</FilesMatch>

Or add the following code at the top of the PHP file:

header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past

4. Use a version control system

Use a version control system to better track your code Change logging and allows you to backtrack to specific code versions. When you encounter problems with page updates that are not timely, you can use a version control system to help you rebuild the page.

5. Use timestamps

You can add a timestamp at the end of the resource file to make the resource URL unique when it changes. In this way, when you modify the file, the browser will detect that the URL of the resource has changed and will request the resource again, thus avoiding problems that cannot be solved using the above method.

3. Summary

When using PHP for page optimization, you may encounter the problem of page updates not being timely. This may be due to browser cache, PHP cache, or proxy cache, etc. To address these issues, you can manually clear the browser cache, change PHP cache settings, disable proxy cache, use a version control system, or add a timestamp, etc. In actual combat, you can choose the corresponding solution according to the actual situation.

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