It’s a standalone plugin that fixes caching issues in browsers, like Chrome, Firefox, and Internet Explorer.
Caching plugins do something very different —?they essentially turn PHP-generated pages into much faster static HTML.
Busted solves a problem not with PHP pages, but with Javascript and CSS. These files have a tendency to not get updated by local browsers at the time you change them. Instead, browsers will continue showing the “old” version of the site, because it doesn’t know that the version on your server has been updated.
Busted solves that problem by adding a small flag to Javascript and CSS files that notes the time that they were last updated. This way, browsers notice that date, and if it’s newer than the version it currently has, it requests it immediately.
Busted is most useful in situations where you’re working with a client and updating a site frequently, but it can also be run on production sites if you want to keep things fresh for intermittent changes.
