Need Help creating same QR code multiple times

[Clineson Redcross]

I have been using your code successfully for quite some time now. However I have a problem with producing the same(or similar) QR code multiple times. It seems that once I run the code once it successfully saves the QR code to a file. The second time I run the code with with same parameters (except the filename which I change by augmenting the end with '-1.jpg', '-2.jpg', etc.) it will produce the same code successfully again. However, if the same code is run three or more times it will not produce a QR code saving it to a file.

The contents of the QR code is a url which is consistent each time I run the code. I tried to change the url by passing different variables to the url each time I ran the code such as '?uid=45' but this did not resolve the problem.

The purpose of my code is to add a QR code to a coupon. In some cases a business does not mind for a client to download the same coupon multiple times. Here's where the problems occurs; when a client wants to download the same coupon a third time or more.

What change can I do/change so that the code will save the same content to a QR code sent to a file each time it is run? Here is my code:

//qrcode generator
include('qrcode/qrlib.php');

// save QR codes to server with coupon    
$tempDir = "images/avatars/buscredits/coupons/"; 
$codeContents = "www.whosyourbrother.org/verifyoffer.php?bid=".$busid."&offer=".$adnum."&mid=3".$userid;

$fileNameWO = md5($codeContents);
$fileName = $fileNameWO.'.jpg';                 
$pngAbsoluteFilePath = $tempDir.$fileName;

//if file exist alter name with hypen and increasing number

/*=================================================
Filename Change Code Goes Here

=================================================*/

//record coupon instance in database
$couponid = $dt->recordCoupon($busid, $userid, $adnum, $fileName);

//generate QR Code and merge with coupon
if (!file_exists($pngAbsoluteFilePath)) { 
    define('IMAGE_WIDTH',285);
define('IMAGE_HEIGHT',285);
    QRcode::png($codeContents, $pngAbsoluteFilePath);

    //Merge qrcode with coupon
$srcFile = "images/avatars/buscredits/buscoupons/".$buscoupon;
$qrcodePNG = "images/avatars/buscredits/coupons/".$fileName;

//create copy of coupon and save
$dest = imagecreatetruecolor(718, 1052);
$src = imagecreatefromjpeg($srcFile);    
imagecopyresampled($dest, $src, 0, 0, 0, 0, 718, 1052, 718, 1052);
//merge QR code with Coupon
$src2 = imagecreatefrompng($qrcodePNG);    
imagecopymerge ($dest, $src2, 217, 687, 0, 0, 285, 285, 100);

//Save coupon with Qr code to file
imagejpeg($dest,$qrcodePNG);    
}

?>