Magento - How to Access key values from Magento->getData() method?

 - If we want to get values from Magento->getData() method return array,

$_items = $order->getItemsCollection();

foreach ($_items as $one_item) {

            Zend_Debug::dump($one_item->getData()); 

}

for above we got respons like below,

array(82) {
  ["item_id"] => string(2) "58"
  ["order_id"] => string(2) "45"
  ["parent_item_id"] => NULL
  ["quote_item_id"] => string(2) "61"
  ["store_id"] => string(1) "1"
  ["created_at"] => string(19) "2012-11-21 07:14:43"
  ["updated_at"] => string(19) "2012-11-21 07:14:43"
  ["product_id"] => string(2) "52"
  ["product_type"] => string(6) "simple"
  ["product_options"] => string(179) "a:1:{s:15:"infost";a:3:{s:4:"uc";s:88:"aHR,,";s:7:"product";s:2:"52";s:3:"qty";i:1;}}"

  ["weight"] => string(7) "50.0000"

  ["is_virtual"] => string(1) "0"

  ["sku"] => string(4) "1112"
  ["name"] => string(5) "Chair"
  ["description"] => NULL
  ["applied_rule_ids"] => NULL
  ["additional_data"] => NULL
  ["free_shipping"] => string(1) "0"
  ["is_qty_decimal"] => string(1) "0"
  ["no_discount"] => string(1) "0"
  ["qty_backordered"] => NULL
  ["qty_canceled"] => string(6) "0.0000"
  ["qty_invoiced"] => string(6) "0.0000"
  ["qty_ordered"] => string(6) "1.0000"
  ["qty_refunded"] => string(6) "0.0000"
  ["qty_shipped"] => string(6) "0.0000"
  ["base_cost"] => string(7) "50.0000"
  ["price"] => string(8) "129.9900"
  ["base_price"] => string(8) "129.9900"
  ["original_price"] => string(8) "129.9900"
  ["base_original_price"] => string(8) "129.9900"
  ["tax_percent"] => string(6) "0.0000"
  ["tax_amount"] => string(6) "0.0000"
  ["base_tax_amount"] => string(6) "0.0000"
  ["tax_invoiced"] => string(6) "0.0000"
  ["base_tax_invoiced"] => string(6) "0.0000"
  ["discount_percent"] => string(6) "0.0000"
  ["discount_amount"] => string(6) "0.0000"
  ["base_discount_amount"] => string(6) "0.0000"
  ["discount_invoiced"] => string(6) "0.0000"
  ["base_discount_invoiced"] => string(6) "0.0000"
  ["amount_refunded"] => string(6) "0.0000"
  ["base_amount_refunded"] => string(6) "0.0000"
  ["row_total"] => string(8) "129.9900"
  ["base_row_total"] => string(8) "129.9900"
  ["row_invoiced"] => string(6) "0.0000"
  ["base_row_invoiced"] => string(6) "0.0000"
  ["row_weight"] => string(7) "50.0000"
  ["gift_message_id"] => NULL
  ["gift_message_available"] => NULL
  ["base_tax_before_discount"] => NULL
  ["tax_before_discount"] => NULL
  ["weee_tax_applied"] => string(6) "a:0:{}"
  ["weee_tax_applied_amount"] => string(6) "0.0000"
  ["weee_tax_applied_row_amount"] => string(6) "0.0000"
  ["base_weee_tax_applied_amount"] => string(6) "0.0000"
  ["base_weee_tax_applied_row_amnt"] => string(6) "0.0000"
  ["base_weee_tax_applied_row_amount"] => string(6) "0.0000"
  ["weee_tax_disposition"] => string(6) "0.0000"
  ["weee_tax_row_disposition"] => string(6) "0.0000"
  ["base_weee_tax_disposition"] => string(6) "0.0000"
  ["base_weee_tax_row_disposition"] => string(6) "0.0000"
  ["ext_order_item_id"] => NULL
  ["locked_do_invoice"] => NULL
  ["locked_do_ship"] => NULL
  ["price_incl_tax"] => string(8) "129.9900"
  ["base_price_incl_tax"] => string(8) "129.9900"
  ["row_total_incl_tax"] => string(8) "129.9900"
  ["base_row_total_incl_tax"] => string(8) "129.9900"
  ["hidden_tax_amount"] => NULL
  ["base_hidden_tax_amount"] => NULL
  ["hidden_tax_invoiced"] => NULL
  ["base_hidden_tax_invoiced"] => NULL
  ["hidden_tax_refunded"] => NULL
  ["base_hidden_tax_refunded"] => NULL
  ["is_nominal"] => string(1) "0"
  ["tax_canceled"] => NULL
  ["hidden_tax_canceled"] => NULL
  ["tax_refunded"] => NULL
  ["base_tax_refunded"] => NULL
  ["discount_refunded"] => NULL
  ["base_discount_refunded"] => NULL
}

- From the above we can access data like below, (ex. we need to get orderid)

 "

$one_item->getOrderId();

             (OR)

$one_item->getData('order_id')  "

- Likewise we can access the other datas from that array.