AJAX Image Upload: Manage uploads of image files

This class can manage uploads of image files.

It can process uploaded files perform several types of checks to validate the files like if there was an upload error, the limit of file size, accepted file name extensions and MIME types.

Valid uploaded files are moved to a destination directory. Image files have thumbnail versions created.

A callback function is called with the details of all valid file uploads.

The class can also get the details of previously uploaded files, as well delete files from the destination directory.