How to prevent XSS using HTML/PHP?

Question

How to prevent XSS (cross-site scripting) using only HTML and PHP?

I've seen many other posts on this topic, but I haven't found one that clearly and concisely explains how to actually prevent XSS.

Answer 1

Basically you need to use the function htmlspecialchars() whenever you want to output something to the browser in an HTML context.

The correct way to use this function is as follows:

echo htmlspecialchars($string, ENT_QUOTES, 'UTF-8');

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