Magento 1.4.2快速生成订单函数：简化checkout过程

Magento 1.4.2 简便生成订单函数
说明：本函数只需要传入一个包含地址信息的客户对象，和产品编号及数量的数组，即可生成一个订单引用对象，随后便可简便生成订单，内容虽少，
但确实找了不少时间。具体用法如有疑问，请联系 seiferli@gmail.com.

/**
 * Reset and Generate new data with product array into order quote, quote referernce table.
 * 
 * @param Mage_Customer_Model_Customer $customer
 * @param Array $productArray   array('1010'=>1,'1012'=>2,...)
 * @param Mage_Core_Model_Store $store
 * @param String $carrierData 'freeshipping_freeshipping'|'flatrate_flatrate'
 * @param Array $paymentData array('method'=>'free') 'free'|'checkmo'|'bkext_payment'|'cosmo99bill_payment'|'alipay_payment'
 * @param Object $session       set quote in session
 * 
 * @return Mage_Sales_Model_Quote
 */
    public function generateQuote(Mage_Customer_Model_Customer $customer, $productArray, Mage_Core_Model_Store $store=NULL, $carrierData='flatrate_flatrate', $paymentData=array('method'=>'bkext_payment'), $session=NULL )
    {
     /** check params is validable. **/
     if ( !$customer instanceof Mage_Customer_Model_Customer ) {
     throw new Mage_Core_Exception('Customer model must be Mage_Customer_Model_Customer!');
     }
     if ( !$address = $customer->getPrimaryShippingAddress() ) {
     throw new Mage_Core_Exception('Customer must have default shipping address!');
     }
     if ( !$customer->getId() ) {
     throw new Mage_Core_Exception('Customer info errer!');
     }
     if ( count($productArray)== 0 ) {
     throw new Mage_Core_Exception('Empty product items!');