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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.