Хранение и порядок

array(2) {
  [1]=>
  array(1) {
    ["ZERO-INF"]=>
    array(6) {
      ["ID"]=>
      string(6) "819963"
      ["PRICE"]=>
      float(0)
      ["DISCOUNT_PRICE"]=>
      float(0)
      ["UNROUND_DISCOUNT_PRICE"]=>
      float(0)
      ["CURRENCY"]=>
      string(3) "RUB"
      ["VAT_RATE"]=>
      float(0.2)
    }
  }
  [6]=>
  array(1) {
    ["ZERO-INF"]=>
    array(6) {
      ["ID"]=>
      string(6) "819964"
      ["PRICE"]=>
      float(0)
      ["DISCOUNT_PRICE"]=>
      float(0)
      ["UNROUND_DISCOUNT_PRICE"]=>
      float(0)
      ["CURRENCY"]=>
      string(3) "RUB"
      ["VAT_RATE"]=>
      float(0.2)
    }
  }
}

array(2) {
  [1]=>
  array(1) {
    ["ZERO-INF"]=>
    array(6) {
      ["ID"]=>
      string(6) "819960"
      ["PRICE"]=>
      float(0)
      ["DISCOUNT_PRICE"]=>
      float(0)
      ["UNROUND_DISCOUNT_PRICE"]=>
      float(0)
      ["CURRENCY"]=>
      string(3) "RUB"
      ["VAT_RATE"]=>
      float(0.2)
    }
  }
  [6]=>
  array(1) {
    ["ZERO-INF"]=>
    array(6) {
      ["ID"]=>
      string(6) "819961"
      ["PRICE"]=>
      float(0)
      ["DISCOUNT_PRICE"]=>
      float(0)
      ["UNROUND_DISCOUNT_PRICE"]=>
      float(0)
      ["CURRENCY"]=>
      string(3) "RUB"
      ["VAT_RATE"]=>
      float(0.2)
    }
  }
}