(no version information, might be only in CVS)
Memcache::flush -- Flush all existing items at the server
Description
bool 
Memcache::flush ( void  )
   Memcache::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.