PHP create jpg file | GD library does not work on JPG - php

Question

I am following this tutorial: Tutorial
In the PHP script it uses the GD library to move and save files.
This script is working fine when i am using it on my local WAMP server.
But when I upload it to my hosting on YourHosting it does not, When i use a JPEG or PNG file it works but when I use a .JPG file it does not work.
This is part of the code:
$sTempFileNameFirst = TEMPLATEPATH;
$sTempFileNameFirstSrc = get_bloginfo('template_directory');
$sTempFileNameLast = '/cache/' . md5(time().rand());
$sTempFileName = $sTempFileNameFirst . $sTempFileNameLast;
$sTempFileNameSrc = $sTempFileNameFirstSrc . $sTempFileNameLast;
// move uploaded file into cache folder
move_uploaded_file($_FILES['upload-image']['tmp_name'], $sTempFileName);
// change file permission to 644
#chmod($sTempFileName, 0644);
if (file_exists($sTempFileName) && filesize($sTempFileName) > 0) {
$aSize = getimagesize($sTempFileName); // try to obtain image info
if (!$aSize) {
#unlink($sTempFileName);
return;
}
// check for image type
switch($aSize[2]) {
case IMAGETYPE_JPEG:
$sExt = '.jpg';
echo("jpg");
// create a new image from file
$vImg = #imagecreatefromjpeg($sTempFileName);
break;
case IMAGETYPE_PNG:
$sExt = '.png';
// create a new image from file
$vImg = #imagecreatefrompng($sTempFileName);
break;
default:
#unlink($sTempFileName);
echo("unlink");
return;
}
echo("before truecolor");
// create a new true color image
$vDstImg = #imagecreatetruecolor( $iWidth, $iHeight ) or die ("can't open gd stream");
echo("after imagetruecolor");
// copy and resize part of an image with resampling
imagecopyresampled($vDstImg, $vImg, 0, 0, (int)$_POST['x1'], (int)$_POST['y1'], $iWidth, $iHeight, (int)$_POST['width'], (int)$_POST['height']);
echo("after resample");
// define a result image filename
//$sResultFileName = $sTempFileName . $sExt;
$sResultFileNameSrc = $sTempFileNameSrc . $sExt;
echo($sResultFileNameSrc);
// output image to file
imagejpeg($vDstImg, $sResultFileName, $iJpgQuality);
#unlink($sTempFileName);
return $sResultFileNameSrc;
As you can see I use echo to see where it works and where it does not. So for JPEG and PNG files every code works, but whenever i use a JPG file the echo before #imagecreatetruecolor works but after does not work. So the problem is that that function does not execute. Also the "or die" part after the function does not work.
What could be the problem?
PHPINFO() says GD info is enabled and has bundled version(2.1.0)