HTML purifying in php

Question

I am writing PHP class which have to remove all potentially dangerous elements or bogus html tag (such as bad links) from HTML source.

Usually I would use HTML Purifier library or similar library,
but self-written code is required in this project.

There are two conditions:

1. It can not have more than 3kB code
2. it should execute really fast

I wrote something that could do the job: http://pihost.pl/purify.php
but i do not know if it is safe enough to use

My question is:
Is there any way to test it properly?
Or maybe someone has quick, small and tested library like this?

Answer 1

An important thing to consider -- how does your purifier react to broken/malformed HTML? To combat that situation, I would suggest running it through PHP tidy first to clean up the HTML, before you purify it.

If you want a series of tests, you can try checking out the tests that HTMLPurifier uses.