# Global namespace

> 2 classes of the Global namespace namespace.

[API reference](/docs/api/index.md) › Global namespace

## Namespaces

| Namespace | Types |
| --- | --- |
| [`yii`](/docs/api/yii/index.md) | 444 |

## Classes

| Class | Summary |
| --- | --- |
| [`Yii`](/docs/api/global/yii/index.md) | Yii is a helper class serving common framework functionalities. |
| [`YiiRequirementChecker`](/docs/api/global/yiirequirementchecker/index.md) | YiiRequirementChecker allows checking, if current system meets the requirements for running the Yii application. |