How to compare texts in PHP or JS?

Question

PHP

Good afternoon, you need to implement the following:

How can I organize this in php or js (if the latter is possible)? An important point - I would not like anything extra. install in php. Only in the form of classes.
So far found PHP Fine Diff . Are there any other solutions?
Thank you!

Answer 1

JS: github.com/cemerick/jsdifflib

Answer 2

Cacycle/diff

Answer 3

Fresh port of google-diff-match-patch to PHP.