Got a tip via email from someone who read this that solved my problem.
Here is a PHP snippet that works:
// Get the QR Code png file from google and display it
$url =
'https://www.google.com/chart?chs=200x200&chld=M|0&cht=qr&chl=otpauth://totp/'.$user_name.'@industrialwebapps.com%3Fsecret%3D'.$otp_key;
$png = file_get_contents($url);
$fn = '/pdfs/test.png';
$fh = fopen('/var/www'.$fn, 'w');
fwrite($fh, $png);
fclose($fh);
echo 'Google Authenticator Key: <b>'.$otp_key.'</b><br />';
echo 'QR Code for some <a href="twoFactorAuth.php"
target="_blank">Smart Phone apps.</a>: ';
echo '<img src="'.$fn.'" />';
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