Query mysql database through memcache

I have been trying to use memcache with MySQL 5.6 but I can not figure out how to do this. I have add an entry into innodb_memcache.containers so I can query the database through memcache. What I would usually do with memcache is get the value for the key by doing this: $value = $memcache->get($key); but in mysql5.6 potentially there could be a lot of tables specified , so using PHP , how do I specify the table I am trying to query against using the memcache layer?.