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<?php
require_once 'app/Mage.php';

Mage::setIsDeveloperMode(true);
ini_set('display_errors', 1);
umask(0);

Mage::app();
Mage::register('isSecureArea', 1);

$ordersToDelete = [
    '100000268',
    '100000267',
    '100000266',
    '100000265',
    '100000264',
    '100000263',
    '100000262',
    '100000261',
    '100000260',
    '100000259',
    '100000255',
    '100000253',
    '100000252',
    '100000251',
    '100000250',
    '100000249',
    '100000248',
    '100000247',
    '100000246',
];

foreach ($ordersToDelete as $incrementId) {

    $order = Mage::getModel('sales/order')->loadByIncrementId($incrementId);

    if ($order && $order->getId()) {

        $invoices = $order->getInvoiceCollection();

        foreach ($invoices as $invoice) {
            $invoice->delete();
        }

        $creditnotes = $order->getCreditmemosCollection();
        foreach ($creditnotes as $creditnote) {
            $creditnote->delete();
        }

        $shipments = $order->getShipmentsCollection();
        foreach ($shipments as $shipment) {
            $shipment->delete();
        }
        
        $order->delete();
        echo 'Order: ' . $incrementId . ' deleted succefully<hr>';
    }
}