> Call it str_escape(string, flags optional, encoding optional) and be done 
> with it.

Keeping it simple definitely preferred

> 1) do we even need encoding or is UTF8 just fine

Definitely need encoding.

mbstring supports quite a lot

http://php.net/manual/en/mbstring.supported-encodings.php

I think you'd need to at least approximately match those encodings,
perhaps there is code already there that can be depended upon?

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