Creating Image Thumbnails

[ralphiooo]

Hi, I'm putting the finishing touches on an image upload script. I have the image uploading successfully but now I wish to create a thumbnail from it. I have the following function setup:

function upload_thumbnail($file_name, $thumbnail_width, $thumbnail_height) {
	$image = imagecreatefromjpeg($this->path . $file_name);
echo $this->path . $file_name;
	list($width, $height) = getimagesize($image);

	if ($width < $height) {
		$thumbnail_width = ($thumbnail_height / $height) * $width;
	} else {
		$thumbnail_height = ($thumbnail_width / $width) * $height;
	}

	$thumbnail = imagecreatetruecolor($thumbnail_width, $thumbnail_height);
	imagecopyresampled($thumbnail, $image, 0, 0, 0, 0, $thumbnail_width, $thumbnail_height, width, height);
	imagejpeg($thumbnail, $this->path . 'thumbnails/' . $file_name, 100);

	return true;
}

The function is contained within a class where the path is set. The path and file name is the same I use to do the upload so I don't know it should not be working. Here's the error message I'm getting:

Warning: getimagesize(Resource id #18) [function.getimagesize]: failed to open stream: No such file or directory in U:\My Webs\Site\Scripts\CMS\includes\upload.inc.php on line 119

Warning: Division by zero in U:\My Webs\Site\Scripts\CMS\includes\upload.inc.php on line 124

Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in U:\My Webs\Site\Scripts\CMS\includes\upload.inc.php on line 127

Notice: Use of undefined constant width - assumed 'width' in U:\My Webs\Site\Scripts\CMS\includes\upload.inc.php on line 128

Notice: Use of undefined constant height - assumed 'height' in U:\My Webs\Site\Scripts\CMS\includes\upload.inc.php on line 128

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in U:\My Webs\Site\Scripts\CMS\includes\upload.inc.php on line 128

Warning: imagejpeg(): supplied argument is not a valid Image resource in U:\My Webs\Site\Scripts\CMS\includes\upload.inc.php on line 129

I would appreciate it if someone could help. Thanks

btw I definately have the gd2 library turned on (I check with the phpinfo() function).

 

[jpadie]

if you are inside a function you will need to declare the $this object as a global.

try adding this just after the function line

global $this;