Magento create invoice programmatically

$order_id = 1;
 $order = Mage::getModel("sales/order")->load($order_id);

try {

 Mage::throwException(Mage::helper('core')->__('Cannot create an invoice...'));

$invoice = Mage::getModel('sales/service_order', $order)->prepareInvoice();

if (!$invoice->getTotalQty()) {
 Mage::throwException(Mage::helper('core')->__('Cannot create an invoice without products.'));


 $transactionSave = Mage::getModel('core/resource_transaction')


 catch (Mage_Core_Exception $e) {
 echo $e->getMessage();

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Hello, I am a software developer from Bangladesh. I develop professional web sites/applications using LAMP(Linux, Apache, MySql, PHP) Stack. I have 7 years of professional working experience developing websites on WordPress, Magento, Laravel, Yii, Code Igniter. I have in depth knowledge on following language and tools, PHP, C, C++, Java, MySql, HTML(5), CSS(3), JavaScript, jQuery, Linux, Windows, Apache, Ngnix.

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