delete order items in magento

<?php require 'app/Mage.php';
Mage::app('admin')->setUseSessionInUrl(false);                                                                                                               
//replace your own orders numbers here:
$test_order_ids=array('100000001','100000002','100000003');
foreach($test_order_ids as $id){
    try{
        Mage::getModel('sales/order')->loadByIncrementId($id)->delete();
        echo "order #".$id." is removed".PHP_EOL;
    }catch(Exception $e){
        echo "order #".$id." could not be remvoved: ".$e->getMessage().PHP_EOL;
    }
}
echo "complete."
?>