Characters in text interfere with XML validation. How to decide?

Question

PHP

When generating xml, sometimes it gets information that contains some html-images (screen), and as a result - an error when validating xml .
Can you tell me how to exclude such characters?

Answer 1

https://ru.m.wikipedia.org/wiki/CDATA
Perhaps this is a question

Answer 2

With the help of "white" list and regex expressions.