Highlight the difference between two strings in PHP

Question

What is the easiest way to highlight the difference between two strings in PHP?

I\'m thinking along the lines of the Stack Overflow edit history page, where new text

Answer 1

There is also a PECL extension for xdiff:

• http://php.net/manual/en/book.xdiff.php
• http://pecl.php.net/package/xdiff

In particular:

• xdiff_string_diff — Make unified diff of two strings

Example from PHP Manual: