Remove all orders Magento 1.9

remove_all_orders_magento.php

<?php
require_once('app/Mage.php');
ini_set('display_errors', 1);
Mage::app('admin');
$orderIds = array(1,2,3,4);
$orders = Mage::getModel('sales/order')->getCollection()
    ->addFieldToFilter('entity_id', (array) $orderIds);
foreach ($orders as $o) {
    //load order object - I know it's not ok to use load in a loop but it should be ok since it's a one time script
    $order = Mage::getModel('sales/order')->load($o->getId());

    $invoices = $order->getInvoiceCollection();
    foreach ($invoices as $invoice){
        //delete all invoice items
        $items = $invoice->getAllItems(); 
        foreach ($items as $item) {
            $item->delete();
        }
        //delete invoice
        $invoice->delete();
    }
    $creditnotes = $order->getCreditmemosCollection();
    foreach ($creditnotes as $creditnote){
        //delete all creditnote items
        $items = $creditnote->getAllItems(); 
        foreach ($items as $item) {
            $item->delete();
        }
        //delete credit note
        $creditnote->delete();
    }
    $shipments = $order->getShipmentsCollection();
    foreach ($shipments as $shipment){
        //delete all shipment items
        $items = $shipment->getAllItems(); 
        foreach ($items as $item) {
            $item->delete();
        }
        //delete shipment
        $shipment->delete();
    }
    //delete all order items
    $items = $order->getAllItems(); 
    foreach ($items as $item) {
        $item->delete();
    }
    //delete payment - not sure about this one
    $order->getPayment()->delete();
    //delete quote - this can be skipped
    if ($order->getQuote()) {
        foreach ($order->getQuote()->getAllItems() as $item) {
            $item->delete();
        }
        $order->getQuote()->delete();
    }
    //delete order
    $order->delete();
}

// erases order grid data
$connection = Mage::getSingleton('core/resource')->getConnection('core_write');
$sql        = "DELETE FROM `mg19_sales_flat_order_grid` WHERE entity_id IN ('".implode(",",$orderIds)."');";
echo $sql;
$rows       = $connection->fetchAll($sql);