gistfile1.txt

namespace common\components;

use \yii\web\UrlManager as BaseUrlManager;

class UrlManager extends BaseUrlManager {
    
    protected $choice;
    
    public function init() {
        if ($this->choice === null) {
            $this->choice = $this->rulesChooser();
        }
    
        parent::init();
    }

    protected function rulesChooser() {
        ...
    }
}