&reftitle.constants; Name Description MEMCACHE_COMPRESSED (integer) Used to turn on-the-fly data compression on with Memcache::set, Memcache::add&listendand; Memcache::replace. MEMCACHE_HAVE_SESSION (integer) 1 if this Memcache session handler is available, 0 otherwise. MEMCACHE_USER1 (integer) Used to turn user-defined application flag on with Memcache::set, Memcache::add&listendand; Memcache::replace. MEMCACHE_USER2 (integer) Used to turn user-defined application flag on with Memcache::set, Memcache::add&listendand; Memcache::replace. MEMCACHE_USER3 (integer) Used to turn user-defined application flag on with Memcache::set, Memcache::add&listendand; Memcache::replace. MEMCACHE_USER4 (integer) Used to turn user-defined application flag on with Memcache::set, Memcache::add&listendand; Memcache::replace.