HTML5PHPbase64 image compression program source code

Nowadays, many WEB upload programs including WeChat, QQ, etc. will automatically compress (attenuate) the pictures when sending some pictures, which can effectively ensure the speed and save user traffic. This example uses the base64 picture compression algorithm to compress the pictures proportionally. The compression ratio can be adjusted yourself. This code can be expanded to compress images and then upload them. However, the example of this source code does not include the upload part. The upload part obtains the compressed image content mainly as a hidden field. There are many programs for reference in the upload part. I will not give a focused demonstration. Please Forgive me.