I am using a function to show custom information on an invoice: (app/code/core/Mage/Sales/Model/Order/Pdf/invoice.php)

public function customtext($page)
    $page->drawText(Mage::helper('sales')->__('custom text '), 35, $this->y, 'UTF-8');

Added at end of invoice.php, and $this->customtext($page); added to end of public function getPdf($invoices = array()) above $this->_afterGetPdf();

But I want to include in my custom text the value of 20% of my invoice Grand Total. How is this done?


if you can pass yo your function the invoice object you are displaying you can do it like this:

public function customtext($page, $invoice)
    $price = $invoice->getGrandTotal() * 20 /100;
    $order = $invoice->getOrder();
    $page->drawText(Mage::helper('sales')->__($order->formatPriceTxt($price)), 35, $this->y, 'UTF-8');
  • Looks good but I get error - Call to a member function getGrandTotal() on a non-object – Jon Sep 20 '16 at 11:53
  • also getting errors - Call to a member function getOrder() on a non-object & Call to a member function formatPriceTxt() on a non-object. I added more specific details to my coding in the above queston – Jon Sep 20 '16 at 12:04
  • that's because $invoice is not an object in your case. I explained that this works only if you can pass the invoice parameter to your method – Marius Sep 20 '16 at 12:20
  • I needed to change $this->customtext($page); to customtext($page, $invoice); when calling the function – Jon Sep 21 '16 at 13:38

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