Question

Is it possible to reload (or delete) the wp-super-cache from a php script? Is there a specific function for that?

Answer 1

http://ocaoimh.ie/wp-super-cache-developers/ says:

Clearing the Cache

The development version of the plugin includes the following function. However, as this code hasn’t been released you cannot depend on this function being available on WordPress blogs just yet.

1    function wp_cache_clear_cache() {
2            global $cache_path;
3            prune_super_cache( $cache_path . 'supercache/', true );
4            prune_super_cache( $cache_path, true );
5    }

If you need this functionality in a plugin now, call prune_super_cache() directly. Please sanity check it however as it’s a very powerful command!

Delete the cache files for a single post by using the wp_cache_post_change( $post_id ) function. It will attempt to delete every half-on cache file for that post, as well as any supercache files.