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yii2/docs/guide/basic-aliases.md

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Path Aliases

Note: This chapter is under development.

Yii 2.0 expands the usage of path aliases to both file/directory paths and URLs. An alias must start with an @ symbol so that it can be differentiated from file/directory paths and URLs. For example, the alias @yii refers to the Yii installation directory while @web contains the base URL for the currently running web application. Path aliases are supported in most places in the Yii core code. For example, FileCache::cachePath can accept both a path alias and a normal directory path.

Path aliases are also closely related to class namespaces. It is recommended that a path alias should be defined for each root namespace so that Yii's class autoloader can be used without any further configuration. For example, because @yii refers to the Yii installation directory, a class like yii\web\Request can be autoloaded by Yii. If you use a third party library such as Zend Framework, you may define a path alias @Zend which refers to its installation directory and Yii will be able to autoload any class in this library.

The following aliases are predefined by the core framework:

  • @yii - framework directory.
  • @app - base path of currently running application.
  • @runtime - runtime directory.
  • @vendor - Composer vendor directory.
  • @webroot - web root directory of currently running web application.
  • @web - base URL of currently running web application.