If you're doing it for security reasons then it gets a lot harder as there's numerous ways of encoding those characters which will bypass most filtering techniques - check out some XSS tutorials to see just how many there are *sigh*.

I agree with imvain2 that strip_tags is probably the easiest way of stripping the tags out.

To be really safe though you could do a regex which only allows Alpha and Numeric characters to remain.

Cheers,
Niggles

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