yii\db\ActiveQuery::getQueryTableName PHP Method

    private function getQueryTableName($query)
    {
        if (empty($query->from)) {
            /* @var $modelClass ActiveRecord */
            $modelClass = $query->modelClass;
            $tableName = $modelClass::tableName();
        } else {
            $tableName = '';
            foreach ($query->from as $alias => $tableName) {
                if (is_string($alias)) {
                    return [$tableName, $alias];
                } else {
                    break;
                }
            }
        }
        if (preg_match('/^(.*?)\\s+({{\\w+}}|\\w+)$/', $tableName, $matches)) {
            $alias = $matches[2];
        } else {
            $alias = $tableName;
        }
        return [$tableName, $alias];
    }