#7 QR Code Generation Fails After Two or More Attemps

[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 when 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 and save 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 php code is to add a QR code to a coupon. In some cases a business who orders a coupon from us 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 three times or more.
What change can I make so that the php code will produce a QR code having the same url for content no matter how many times the code is run? Here is my code:
<?php
//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);
}
?>

Thanks For Your Help,

Wade Redcross

[Dominik Dzienia]

Hi,

(regarding your priv msg - i am not notified about tickets/request, please use e-mail provided by project website to get support, and - as for many other open source projects - it may take a while to get responce since i do it in spare time)

1. is it for sure script problem? try to check server directory write rights etc.
2. your coude (GD2 scaling part) lacks imagedestroy(), maybe there are memory issues after second run preventing following runs to execute?
3. try to enclose whole code with output buffering (ob_start(); $log = ob_get_contents(); ob_end_clean(); and saving $log to some file with file_put_contents. What the log says?

write me an email how it going / for further questions (deltalab@poczta.fm)

Regards,
Dominik