While checking PHP extensions in EasyApache 4, Memcache 4.0.5 is not listed as available to install.
The current release of EasyApache does not include the latest version of Memcache, and some applications such as Drupal require an updated version of the Memcache extension.
Memcache 4.0.5 can be installed manually through PECL in WHM or via command line
1) Navigate to WHM >> Module Installers >> PHP PECL >> Manage
2) Under Install a PHP PECL, insert “memcache-184.108.40.206” and click install
3) Module should be installed