Drop-ins

Drop-ins are files designed to replace, add, or enhance specific WordPress Core features.

A limited set of drop-ins are provisioned for all WordPress environments on the VIP Platform by VIP MU plugins:

• db.php: Adds Automattic’s HyperDB database class.
• object-cache.php
• sunrise.php: Customers can modify sunrise.php by creating and editing a client-sunrise.php file in their application’s wpcomvip GitHub repository.

No other drop-ins can be added to a WordPress site. If a drop-in is added to an application’s GitHub repository, it will be ignored by the environment.

The Automattic-authored Maintenance Mode plugin is the suggested alternative to the commonly used maintenance.php drop-in.