How to get the website root directory in Yii

When using Yii as an image server, you often need to deal with absolute paths.

(Recommended tutorial: yii)

First of all, you need to know what the root directory of the website is.

There are the following 3 methods:

1. Use dirname(__FILE__) in the index.php file and save it

2. Use Yii::app()- >basePath, this points to the protected directory, just go back one level: Yii::app()->basePath.'/../'

3. Use Yii::getPathOfAlias ('webroot').'/'

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