yii\db\Connection::quoteColumnName PHP Méthode

    public function quoteColumnName($name)
    {
        return $this->getSchema()->quoteColumnName($name);
    }

 /**
  * @param integer $count
  * @return \Generator
  * @throws Exception
  */
 public function export($count)
 {
     if (!$this->table) {
         throw new Exception("table name is required");
     }
     if (is_null($this->db)) {
         $this->db = \Yii::$app->get($this->db_component);
     }
     $this->table_quoted = $this->db->quoteTableName($this->table);
     $this->truncate();
     $first_row = $this->generator->generate()->current();
     // prepare quoted fileds name list
     $fields = array_map(function ($i) {
         return $this->db->quoteColumnName($i);
     }, array_keys($first_row));
     $fields_str = implode(",", $fields);
     // prepare values section, repeat values block $rows_per_request number
     $rows_per_request = 1;
     if ($this->multirow) {
         $rows_per_request = (int) max(floor($this->placeholder_limit / count($fields)), 1);
     }
     $placeholders = "(" . implode(",", array_fill(1, count($fields), '?')) . ")";
     $value_placeholders = implode(",", array_fill(1, $rows_per_request, $placeholders));
     // finally sql request
     $prepare = $this->db->createCommand("INSERT INTO {$this->table_quoted}({$fields_str}) VALUES {$value_placeholders}");
     // first row of data, lets save it
     $insert_values = $this->array1based($first_row);
     $prepared_rows = 1;
     foreach ($this->generator->generate() as $item) {
         if ($prepared_rows === $rows_per_request) {
             unset($insert_values[0]);
             $prepare->bindValues($insert_values);
             $prepare->execute();
             $count = $count - $rows_per_request;
             if ($count <= 0) {
                 break;
             }
             (yield $count);
             $insert_values = $this->array1based($item);
             $prepared_rows = 1;
         } else {
             $insert_values = array_merge($insert_values, array_values($item));
             $prepared_rows++;
         }
     }
 }