@aaron noticed that the php-memcached extension has various breaking changes in the release for PHP 7.
- The method signature of get, getByKey, getMulti, and getMultiByKey changed.
- get* and getMulti* commands no longer take cas or user flags parameters.
- get* and getMulti* commands now take the Memcached::GET_EXTENDED flag to retrieve user flags and cas tokens.
- The default protocol was changed from text to binary protocol. If your memcached setup does not support the binary protocol (e.g. if using twemproxy), then set memcached.sess_binary_protocol = Off. (Previously called memcached.sess_binary)