Use call back function to proccess Magento large collection
$orders = Mage::getModel('sales/order')->getCollection();Mage::getSingleton('core/resource_iterator')->walk($orders->getSelect(), array(array($this,'proccessOrder')));public function proccessOrder($args){$order = Mage::getModel('sales/order');$order->setData($args['row']);echo $order->getIncrementId() . '<br/>';echo $order->getGrandTotal(). '<br />';$orderAmount = $orderAmount+$order->getGrandTotal();echo '----------------------<br/>';}
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