Generate thumbnails and copyrighted classes for images

Generate thumbnails and copyrighted classes for images
I have looked at PHP's image processing functions in the past few days. In the past, there were few requirements in this field, so I didn't have to worry about it. I feel that some simple functions of image processing are still acceptable. Even if it is complicated, the GD database is 2.0.1 and still does not support Chinese. I have read several articles, if you want to use Chinese characters, you can only convert GB2312 to UNICODE before writing the image. This is too troublesome. Simply use English. In the image generation part, you can define the maximum height and width of the image, which is suitable for news and album systems. GD2.0.1 has greatly improved image processing. I tried imageCopyResized and imageCopyResampled, and the latter processed images much better than the former, according to the manual, the latter basically keeps the image with the changed size undistorted, and the effect of generating thumbnails is really good.
--------------------------------------------------------------- The following is a class -----------------------