I'm using the GD image library to successfully resize images.

But I have not yet been able to get the imagerotate() function working. The error is: Call to undefined function: imagerotate()

At this point, I'm not certain if it is supported on my server and I'm having trouble finding my exact version of GD. Using phpinfo() I see that I'm using: PHP version 4.3.1 and GD is listed as "2.0 or higher".

How can I learn my specific version of GD?