protected function _extractQuoteBillingData(Mage_Sales_Model_Quote $quote)
    {
        $address = $quote->getBillingAddress();
        return $address ?
            $this->_extractAddressData($address) :
            array();
    }
protected function _extractQuoteBillingData(Mage_Sales_Model_Quote $quote)
    {
        $address = $quote->getBillingAddress();
        return $address ?
            $this->_extractAddressData($address) :
            array();
    }
protected function _extractQuoteBillingData ( Mage_Sales_Model_Quote $ quote ) { $ address = $ quote -> getBillingAddress ( ) ; return $ address ? $ this -> _extractAddressData ( $ address ) : array ( ) ; }
Return array of billing address data if available, otherwise, an empty array
@param  Mage_Sales_Model_Quote $quote Quote object to extract data from
@return array Array of billing address data
Return array of billing address data if available otherwise an empty array