PHP image processing

Image processing is also one of the things that PHP often encounters in actual work, which is processing pictures.

There are many scenarios for processing pictures:

1. Generate verification code
2. Picture scaling
3. Picture watermark
4. Secret password card
5. Histogram

... ...Wait

1. Generate verification code

2. Image scaling

#Note: The avatar in the experiment was originally a large image, but became a small avatar in Weibo.

3. Picture watermark

4. Histogram

5. Password card