wordpress Prevent CSS Caching
WordPress:
<link rel="stylesheet" href="<?php bloginfo('stylesheet_url'); echo '?' . filemtime( get_stylesheet_directory() . '/style.css'); ?>" type="text/css" media="screen" />
bbPress:
<link rel="stylesheet" href="<?php bb_stylesheet_uri(); echo '?' . filemtime( bb_get_active_theme_directory() . '/style.css'); ?>" type="text/css" media="screen" />
Adds stylesheet with time of last update. If the number changes the browser updates the CSS instead of using cached version. Easily amended to be none WP specific.