别名定义问题

来源于stackoverflow

1.
In config folder create file aliases.php. And put this:

Yii::setAlias('webroot', dirname(dirname(__DIR__)) . '/web'); 
Yii::setAlias('editor_lang_dir', '@webroot/scripts/sceditor/languages/');

In web folder in index.php file put: require(__DIR__ . '/../config/aliases.php');

Before:

(new yii\web\Application($config))->run();

If run echo in view file:

echo Yii::getAlias('@editor_lang_dir');

Show like this:

C:\OpenServer\domains\yii2_basic/web/scripts/sceditor/languages/

 

2.

源码是这样的，就是说@webroot是在这里定义的，用它们两个去定义其他别名是不行的，除非包含了yii.php文件
protected function bootstrap()
    {
        $request = $this->getRequest();
        Yii::setAlias('@webroot', dirname($request->getScriptFile()));
        Yii::setAlias('@web', $request->getBaseUrl());
        parent::bootstrap();
    }




Yii2 basic application

To set inside config file, write this inside $config array
'aliases' => [
        '@name1' => 'path/to/path1',
        '@name2' => 'path/to/path2',
    ],

=======
The @yii alias is defined when you include the Yii.php file in your entry script. The rest of the aliases are defined in the application constructor when applying the application configuration.

If you need to use predefined alias, write one component and link it in config bootstrap array

namespace app\components;

use Yii;
use yii\base\Component;

class Aliases extends Component
{
    public function init() 
    {
       Yii::setAlias('@editor_lang_dir', Yii::getAlias('@webroot').'/scripts/sceditor/languages/');
    }
}
// and inside config file, add 'app\components\Aliases' to bootstrap array

'bootstrap' => [
        'log',        
        'app\components\Aliases',        
],

3.
@webroot alias is not available at this point, it is defined during application bootstrap :

https://github.com/yiisoft/yii2/blob/2.0.3/framework/web/Application.php#L60

No need to define this alias yourself, you should simply use another one :

'aliases' => [
    // Set the editor language dir
    '@editor_lang_dir' => '@app/web/scripts/sceditor/languages/',
],