+found. No error is given on keys that are not found. You must call either
+memcached_fetch() or memcached_fetch_result() after a successful call to
+memcached_mget(). You should continue to call these functions until they
+return NULL (aka no more values). If you need to quit in the middle of a
+memcached_get() call, execute a memcached_quit(). After you do this, you can
+issue new queries against the server.