hoe werken met een qr code font?

<?php
include "../main/instellingen.php";
header("content-type: image/png");
$image = imagecreatefrompng("tiket.png"); // achtergrondfoto
$zwart  = ImageColorAllocate($image, 0,   0,   0); // tekstkleur
$groen  = ImageColorAllocate($image, 50,   95,   62); // tekstkleur
$rood  = ImageColorAllocate($image, 237,   51,   56); // tekstkleur
$font1 = "AR_BERKLEY.ttf"; //Het lettertype, VERGEET DEZE NIET TE UPLOADEN !
$barcodefont = "qr_font.ttf";
if(!isset($_GET['code'])){
ImageTTFText($image, 20,   0,   162, 182, $rood, $font1, 'ERROR,');
ImageTTFText($image, 20,   0,   162, 205, $rood, $font1, 'niet genoeg gegevens.');
} else {
$sql = "SELECT naam, aantal, prijs, soort, barcode FROM ticket WHERE token = '".mysql_real_escape_string($_GET['code'])."'";

if(!$res = mysql_query($sql))
{
ImageTTFText($image, 20,   0,   162, 182, $rood, $font1, 'ERROR,');
ImageTTFText($image, 10,   0,   162, 205, $rood, $font1, mysql_error());
}
elseif(mysql_num_rows($res) == 0)
{
ImageTTFText($image, 20,   0,   162, 182, $rood, $font1, 'ERROR,');
ImageTTFText($image, 17,   0,   162, 205, $rood, $font1, 'Kan gegevens niet vinden.');
}
else
{
$row = mysql_fetch_assoc($res);
ImageTTFText($image, 18,   0,   162, 22, $rood, $font1, 'Oldtimerbeurs Hoogstraten');
ImageTTFText($image, 13,   0,   162, 39, $groen, $font1, 'Zaterdag 27 en zondag 28 oktober');
ImageTTFText($image, 20,   0,   230, 62, $zwart, $font1, $row['soort']);

ImageTTFText($image, 13,   0,   160, 100, $zwart, $font1, 'Gekocht door: '.$row['naam']);
ImageTTFText($image, 13,   0,   160, 115, $zwart, $font1, 'Voor '.$row['aantal'].' personen');
ImageTTFText($image, 13,   0,   160, 130, $zwart, $font1, 'Aan: '.$row['prijs'].' euro');
//ImageTTFText($image, 13,   0,   230, 62, $zwart, $font1, $row['soort']);

ImageTTFText($image, 23,   0,   165, 205, $zwart, $barcodefont, $row['barcode']);
ImageString($image,  5, 220, 235, $row['barcode'], $zwart);

}
}
imagepng($image);
imagedestroy($image);
?>

<?php
include "../main/instellingen.php";
header("content-type: image/png");
$image = imagecreatefrompng("tiket.png"); // achtergrondfoto
$zwart  = ImageColorAllocate($image, 0,   0,   0); // tekstkleur
$groen  = ImageColorAllocate($image, 50,   95,   62); // tekstkleur
$rood  = ImageColorAllocate($image, 237,   51,   56); // tekstkleur
$font1 = "AR_BERKLEY.ttf"; //Het lettertype, VERGEET DEZE NIET TE UPLOADEN !
$barcodefont = "qr_font.ttf";
if(!isset($_GET['code'])){
ImageTTFText($image, 20,   0,   162, 182, $rood, $font1, 'ERROR,');
ImageTTFText($image, 20,   0,   162, 205, $rood, $font1, 'niet genoeg gegevens.');
} else {
$sql = "SELECT naam, aantal, prijs, soort, barcode FROM ticket WHERE token = '".mysql_real_escape_string($_GET['code'])."'";
 
if(!$res = mysql_query($sql))
{
ImageTTFText($image, 20,   0,   162, 182, $rood, $font1, 'ERROR,');
ImageTTFText($image, 10,   0,   162, 205, $rood, $font1, mysql_error());
}
elseif(mysql_num_rows($res) == 0)
{
ImageTTFText($image, 20,   0,   162, 182, $rood, $font1, 'ERROR,');
ImageTTFText($image, 17,   0,   162, 205, $rood, $font1, 'Kan gegevens niet vinden.');
}
else
{
$row = mysql_fetch_assoc($res);
ImageTTFText($image, 18,   0,   162, 22, $rood, $font1, 'Oldtimerbeurs Hoogstraten');
ImageTTFText($image, 13,   0,   162, 39, $groen, $font1, 'Zaterdag 27 en zondag 28 oktober');
ImageTTFText($image, 20,   0,   230, 62, $zwart, $font1, $row['soort']);
 
ImageTTFText($image, 13,   0,   160, 100, $zwart, $font1, 'Gekocht door: '.$row['naam']);
ImageTTFText($image, 13,   0,   160, 115, $zwart, $font1, 'Voor '.$row['aantal'].' personen');
ImageTTFText($image, 13,   0,   160, 130, $zwart, $font1, 'Aan: '.$row['prijs'].' euro');
//ImageTTFText($image, 13,   0,   230, 62, $zwart, $font1, $row['soort']);
 
ImageTTFText($image, 23,   0,   165, 205, $zwart, $barcodefont, $row['barcode']);
ImageString($image,  5, 220, 235, $row['barcode'], $zwart);
 
}
}
imagepng($image);
imagedestroy($image);
?>

include "qrlib.php"; 

$Qrcode = QRcode::png($row['barcode'], $filename, $errorCorrectionLevel, $matrixPointSize, 2);

ImageTTFText($image, 23,   0,   165, 205, $zwart, $barcodefont, $Qrcode);
ImageString($image,  5, 220, 235, $Qrcode, $zwart);

include "qrlib.php"; 
 
$Qrcode = QRcode::png($row['barcode'], $filename, $errorCorrectionLevel, $matrixPointSize, 2);
 
ImageTTFText($image, 23,   0,   165, 205, $zwart, $barcodefont, $Qrcode);
ImageString($image,  5, 220, 235, $Qrcode, $zwart);