Auto loading config and routing definitions

By default, Symfony does not load configuration and/or routing definitions from bundles but expects you to define everything in app/config (optionally importing config files from bundles or other locations). Pimcore extends the config loading by trying to automatically load config.yml and routing.yml (php, and xml types are also supported) from every active bundle if they are defined in the directory Resources/config/pimcore. By making use of this auto-loading mechanism, you can provide routing and config from within your bundle.

When loading the configuration, Pimcore will first try to load an environment specific config file (e.g. config_dev.yml) from each bundle and fall back to config.yml if no environment specific file is found. If multiple files with different extensions exist, all of them will be loaded.

For example, if a bundle defines a config_dev.yml AND a config_dev.php both of them will be loaded, but there will be no attempt to load a config.yml without the environment.

From the Pimcore\Config\BundleConfigLocator:

/**
 * Locates configs from bundles if Resources/config/pimcore exists.
 *
 * Will first try to locate <name>_<environment>.<suffix> and fall back to <name>.<suffix> if the
 * environment specific lookup didn't find anything. All known suffixes are searched, so e.g. if a config.yml
 * and a config.php exist, both will be used.
 *
 * Example: lookup for config will try to locate the following files from every bundle (will return all files it finds):
 *
 *  - Resources/config/pimcore/config_dev.php
 *  - Resources/config/pimcore/config_dev.yml
 *  - Resources/config/pimcore/config_dev.xml
 *
 * If the previous lookup didn't return any results, it will fall back to:
 *
 *  - Resources/config/pimcore/config.php
 *  - Resources/config/pimcore/config.yml
 *  - Resources/config/pimcore/config.xml
 */
class BundleConfigLocator {}