strip_tags() but not only vulnerability

[Tõnu Samuel <tonu () jes ee>]

Some time ago I wrote document describing common problem with cleaning up 
HTML. PHP manual states some little warning about topic but no solution on 
http://www.php.net/strip_tags

Many websites are still vulnerable and similar problems happen not depending 
on programming language too often:

http://www.jes.ee/~tonu/strip.php

Please do not start flamewar, I know some people might find this information 
useful. Yes, it is not "advanced" and this is why people often do not notice 
the problem.

  Tõnu

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