Phinx makes it ridiculousy easy to manage the database migrations for your PHP app. In less than 5 minutes you can install Phinx and create your first database migration. Phinx is just about migrations without all the bloat of a database ORM system or dependence on an application framework.
Most database migration tools are framework dependent, complicated, confusing to install/configure and a pain in the ass to write migrations for. Phinx was designed to be both flexible and simple. It builds on the best parts from several other projects and creates a powerful, easy-to-use experience.