yii\base\Application::setBasePath PHP Méthode

This method can only be invoked at the beginning of the constructor.

public setBasePath ( string $path )
$path	string	the root directory of the application.

    public function setBasePath($path)
    {
        parent::setBasePath($path);
        Yii::setAlias('@app', $this->getBasePath());
    }

Application