Library for creating smart thumbnails - who came across?

Question

PHP

Guys, I'm looking for a php library to create "smart" thumbnails. That is, the script analyzes the image with some tricky algorithm, selects a section (for example, a square), on which something significant is depicted. I don’t know how it works, but there is an example on js - https://github.com/jwagner/smartcrop.js/
Nobody came across a smart solution on php?..