yii\easyii\AdminModule::getInstalled PHP Method

    public function getInstalled()
    {
        if ($this->_installed === null) {
            try {
                $this->_installed = Yii::$app->db->createCommand("SHOW TABLES LIKE 'easyii_%'")->query()->count() > 0 ? true : false;
            } catch (\Exception $e) {
                $this->_installed = false;
            }
        }
        return $this->_installed;
    }