In yii2.0basic, how do I load a custom namespace into the framework?

Hello everyone! In yii2.0basic, I added a custom namespace such as commonservice. in this folder, there is a class Test. php, in the TestController of controllers. php references it and prompts that it cannot be found after running. it should be because the custom namespace does not exist... hello everyone! In yii2.0basic, I added a custom namespace such as commonservice. in this folder, there is a class Test. php, in the TestController of controllers. when php references it, it always prompts that it cannot be found after running. it should be that the custom namespace is not loaded by the framework, so I don't know it, how can I load a custom namespace in basic? In advanced, the alias should be set in commonconfigbootstrap. php. how can I set the alias in basic? Thank you!

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Hello everyone! In yii2.0basic, I added a custom namespace such as commonservice. in this folder, there is a class Test. php, in the TestController of controllers. when php references it, it always prompts that it cannot be found after running. it should be that the custom namespace is not loaded by the framework, so I don't know it, how can I load a custom namespace in basic? In advanced, the alias should be set in commonconfigbootstrap. php. how can I set the alias in basic? Thank you!