Requirements

PHP: this extension requires PHP 5.4+, version PHP
5.4.4 or never. The required PHP extensions are PCRE (enabled by default), and the
memcached extension
version 2.0.x.

The mysqlnd_memcache Memcache plugin
supports all PHP applications and all available PHP MySQL
extensions (mysqli,
mysql, PDO_MYSQL). The PHP MySQL
extension must be configured with mysqlnd support.

For accessing InnoDB tables, this PHP
extension requires MySQL Server 5.6.6 or newer with the
InnoDB Memcache Daemon Plugin enabled.

For accessing MySQL Cluster NDB tables,
this PHP extension requires MySQL Cluster 7.2 or newer
with the NDB Memcache API nodes enabled.