Create simply install the plugin. This should create a folder under the Pimcore website directory called config (if it doesn't already exist), and create a container.php file. From there, just use PHP-DI as normal!

Container configuration is stored in the Pimcore website directory. The plugin will check if the base container configuration file (website/config/container.php) exists, and if it does not, it will create it for you upon plugin installation (it will not automatically create it at any other point, if it doesn't exist, the plugin will assume it is uninstalled).

You can also specify environment-specific configuration by placing another container configuration file in the configuration folder, like: website/config/container.<ENV>.php. The environment used is pulled from Pimcore's system settings. An example is website/config/container.local.php.

A parameters file can also be created, the plugin will not create it if it doesn't exist though. This file will go in the same folder, and is called website/config/parameters.php.

See the PHP-DI documentation for more information about configuration.

MIT