Debuggin - Cant see the output of echo

Hi there
I was making some changes to the order confirmation e-mail.
So, I started editing
includes/classes/order.php

I have these statements inside the function send_order_email

echo "START";
echo htmlspecialchars($this->products_ordered_html);
echo "END";

But after I complete the test purchase, I cant see this output on any of the pages
Am I doing something wrong?
I am sure this is getting called because when I make errros, the last page of order confirmation doesn't proceed
Please help!

The page does a redirect when it's finished processing, and the redirect wipes the debug output.

Add another line to your code which will halt execution and display your data before redirecting:

echo 'blahblahblah';
echo 'more stuff here';
echo $varContentsOfSomeVariables;
die('Execution stopped to display messages.');

Thanks DrByte!