<ul>
				<?php foreach ($this->item->extra_fields as $key=>$extraField): ?>
				<?php if($extraField->value != ''): ?>
				<li class="<?php echo ($key%2) ? "odd" : "even"; ?> type<?php echo ucfirst($extraField->type); ?> group<?php echo $extraField->group; ?>">
					<?php if($extraField->type == 'header'): ?>
					<h4 class="itemExtraFieldsHeader"><?php echo $extraField->name; ?></h4>
					<?php else: ?>
					<span class="itemExtraFieldsLabel"><?php echo $extraField->name; ?>:</span>
					<span class="itemExtraFieldsValue"><?php echo $extraField->value; ?></span>
					<?php endif; ?>
				</li>
				<?php endif; ?>
				<?php endforeach; ?>
			</ul>

object(TableOrderItems)#489 (30) {
  ["_tbl":protected]=>
  string(21) "#__k2store_orderitems"
  ["_tbl_key":protected]=>
  string(12) "orderitem_id"
  ["_tbl_keys":protected]=>
  array(1) {
    [0]=>
    string(12) "orderitem_id"
  }
  ["_db":protected]=>
  object(JDatabaseDriverMysqli)#15 (23) {
    ["name"]=>
    string(6) "mysqli"
    ["serverType"]=>
    string(5) "mysql"
    ["connection":protected]=>
    object(mysqli)#16 (19) {
      ["affected_rows"]=>
      int(1)
      ["client_info"]=>
      string(79) "mysqlnd 5.0.12-dev - 20150407 - $Id: b5c5906d452ec590732a93b051f3827e02749b83 $"
      ["client_version"]=>
      int(50012)
      ["connect_errno"]=>
      int(0)
      ["connect_error"]=>
      NULL
      ["errno"]=>
      int(0)
      ["error"]=>
      string(0) ""
      ["error_list"]=>
      array(0) {
      }
      ["field_count"]=>
      int(5)
      ["host_info"]=>
      string(25) "Localhost via UNIX socket"
      ["info"]=>
      NULL
      ["insert_id"]=>
      int(0)
      ["server_info"]=>
      string(10) "5.5.52-cll"
      ["server_version"]=>
      int(50552)
      ["stat"]=>
      string(158) "Uptime: 8336177  Threads: 36  Questions: 5457298976  Slow queries: 4574  Opens: 25842187  Flush tables: 1  Open tables: 32768  Queries per second avg: 654.652"
      ["sqlstate"]=>
      string(5) "00000"
      ["protocol_version"]=>
      int(10)
      ["thread_id"]=>
      int(72258564)
      ["warning_count"]=>
      int(0)
    }
    ["nameQuote":protected]=>
    string(1) "`"
    ["nullDate":protected]=>
    string(19) "0000-00-00 00:00:00"
    ["_database":"JDatabaseDriver":private]=>
    string(14) "jozitrad_newww"
    ["count":protected]=>
    int(61)
    ["cursor":protected]=>
    NULL
    ["debug":protected]=>
    bool(false)
    ["limit":protected]=>
    int(0)
    ["log":protected]=>
    array(0) {
    }
    ["timings":protected]=>
    array(0) {
    }
    ["callStacks":protected]=>
    array(0) {
    }
    ["offset":protected]=>
    int(0)
    ["options":protected]=>
    array(9) {
      ["driver"]=>
      string(6) "mysqli"
      ["host"]=>
      string(9) "localhost"
      ["user"]=>
      string(14) "jozitrad_newww"
      ["password"]=>
      string(12) "removedddd"
      ["database"]=>
      string(14) "jozitrad_newww"
      ["prefix"]=>
      string(6) "ejkb4_"
      ["select"]=>
      bool(true)
      ["port"]=>
      int(3306)
      ["socket"]=>
      NULL
    }
    ["sql":protected]=>
    string(177) "SELECT i.id,i.alias,i.code,i.catid,c.alias AS categoryalias
			FROM #__k2_items as i
			LEFT JOIN #__k2_categories c ON c.id = i.catid
			WHERE i.published =1 AND i.id='9928481'"
    ["tablePrefix":protected]=>
    string(6) "ejkb4_"
    ["utf":protected]=>
    bool(true)
    ["utf8mb4":protected]=>
    bool(true)
    ["errorNum":protected]=>
    int(0)
    ["errorMsg":protected]=>
    string(0) ""
    ["transactionDepth":protected]=>
    int(0)
    ["disconnectHandlers":protected]=>
    array(0) {
    }
  }
  ["_trackAssets":protected]=>
  bool(false)
  ["_rules":protected]=>
  NULL
  ["_locked":protected]=>
  bool(false)
  ["_autoincrement":protected]=>
  bool(true)
  ["_observers":protected]=>
  object(JObserverUpdater)#493 (2) {
    ["observers":protected]=>
    array(0) {
    }
    ["doCallObservers":protected]=>
    bool(true)
  }
  ["_columnAlias":protected]=>
  array(0) {
  }
  ["_jsonEncode":protected]=>
  array(0) {
  }
  ["_errors":protected]=>
  array(1) {
    [0]=>
    string(0) ""
  }
  ["orderitem_id"]=>
  int(135)
  ["order_id"]=>
  int(1497952376)
  ["product_id"]=>
  string(7) "9928481"
  ["orderitem_attributes"]=>
  string(2) "{}"
  ["orderitem_attribute_names"]=>
  string(2) "{}"
  ["orderitem_sku"]=>
  string(17) "11111111222222222"
  ["orderitem_name"]=>
  string(34) "Нов тестов продукт"
  ["orderitem_quantity"]=>
  int(1)
  ["orderitem_price"]=>
  float(0)
  ["orderitem_attributes_price"]=>
  int(0)
  ["orderitem_discount"]=>
  NULL
  ["orderitem_final_price"]=>
  float(0)
  ["orderitem_tax"]=>
  int(0)
  ["orderitem_shipping"]=>
  NULL
  ["orderitem_shipping_tax"]=>
  NULL
  ["orderitem_status"]=>
  NULL
  ["modified_date"]=>
  string(19) "2017-06-20 09:52:56"
  ["_isNew"]=>
  bool(true)
}

<?php echo $item->product_id; ?>