Magento custom order report to CSV

magento-custom-order-report.php

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
require_once 'app/Mage.php';
Mage::app();
//echo "Testando<br>";
$fromDate = date('Y-m-d H:i:s', strtotime('2016-05-28 00:00:01'));
$toDate = date('Y-m-d H:i:s', strtotime('2016-07-28 23:59:59'));
$orders = Mage::getModel('sales/order')->getCollection()
    ->addFieldToSelect('increment_id')
    ->addFieldToSelect('created_at')
    ->addFieldToSelect('base_subtotal_invoiced')
    ->addFieldToSelect('total_paid')
    ->addFieldToSelect('base_shipping_amount')
    ->addFieldToSelect('base_discount_amount')
    ->addAttributeToFilter('main_table.created_at', array('from'=>$fromDate, 'to'=>$toDate))
//    ->addAttributeToFilter('main_table.status', array('eq' => Mage_Sales_Model_Order::STATE_COMPLETE))
    ->addAttributeToFilter('main_table.base_subtotal_invoiced', array('gteq' => 0));

$orders->getSelect()->group('main_table.entity_id');

function array2csv(array &$array)
{
    if (count($array) == 0) {
        return null;
    }
    ob_start();
    $df = fopen("php://output", 'w');
    fputcsv($df, array_keys(reset($array)));
    foreach ($array as $row) {
        fputcsv($df, $row);
    }
    fclose($df);
    return ob_get_clean();
}

function download_send_headers($filename) {
    // disable caching
    $now = gmdate("D, d M Y H:i:s");
    header("Expires: Tue, 03 Jul 2001 06:00:00 GMT");
    header("Cache-Control: max-age=0, no-cache, must-revalidate, proxy-revalidate");
    header("Last-Modified: {$now} GMT");

    // force download
    header("Content-Type: application/force-download");
    header("Content-Type: application/octet-stream");
    header("Content-Type: application/download");

    // disposition / encoding on response body
    header("Content-Disposition: attachment;filename={$filename}");
    header("Content-Transfer-Encoding: binary");
}

echo $orders->count();

download_send_headers("data_export_" . date("Y-m-d") . ".csv");
echo array2csv($orders->getData());
die();

echo $orders->getSelect();

foreach ($orders as $order): ?>
    <br>
    increment ID: <?php echo $order->getIncrementId()?><br>
    Criado em: <?php echo Mage::getModel('core/date')->date('d/m/Y H:i:s', strtotime($order->getCreatedAt()));?><br>
    Subtotal Loja: <?php echo Mage::helper('core')->currency($order->getBaseSubtotalInvoiced(), true, false);?><br>
    Frete: <?php echo Mage::helper('core')->currency($order->getBaseShippingAmount(), true, false);?><br>
    Total Pago: <?php echo Mage::helper('core')->currency( $order->getTotalPaid(), true, false);?><br>
    Desconto: <?php echo Mage::helper('core')->currency( $order->getBaseDiscountAmount(), true, false);?><br>

<?php endforeach;?>