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Boost your page performance by caching individual page
fragments. Works with logged-in users too!  How do I store
multiple fragment caches on the same page (or share a fragment
cache across multiple pages)?  By default, calling new
FragmentCache() will create a key based on the current permalink
URL (e.g. '/posts/12345'). To get around that, you'll have to
pass a unique caching key like so:  // uses unique key. NOTE:
this key is global across your whole site, // so don't use the
same key with a different fragment! $cache = new
FragmentCache(array('key' => 'my-unique-key'));  How is the
cache stored?  Right now it is using a file-based cache system,
meaning it will store .txt files in wp-content/cache.  How does
the cache expire?  The cache is based on a date that you pass
in, or the current page's last updated date, by default. Meaning
if the page gets updated, the cache will be invalidated, and a
new fragment cache will be generated on the next page