(no version information, might be only in CVS)
Memcache::flush -- Flush all existing items at the serverMemcache::flush() immediately invalidates all existing items. Memcache::flush() doesn't actually free any resources, it only marks all the items as expired, so occupied memory will be overwritten by new items.
Also you can use memcache_flush() function. See example below.
Returns TRUE on success or FALSE on failure.