How to update the js file on the client if it has changed on the server?

Question

PHP

When developing a web application, after the next change in js files, cached versions remain on the clients, which causes errors. Not all users know when and how to clear the cache. How to make sure that when updating js files on the server, clients download updated files and do not use outdated versions in the local cache.

Answer 1

<script src="js/file.js?<?=filemtime( 'js/file.js' )?>" />

best file change time

Answer 2

I found a good solution to embed the md5 hash of the file in the URL of the link, when the file changes, the hash will change and the file will be downloaded by the client. stackoverflow.com/questions/118884/what-is-an-eleg...

Answer 3

add file version
<script src="js/main.js?v2.01">

Answer 4

The easiest way to add salt to script loading is:

<script src="script.js?<?=rand()?>" type="text/javascript"></script>