Strange, no idea why it would not be working then suddenly be working. Seams to be working fine in my tests. If the GET variable doesn't exist though it would cause the substitution to fail, which would just end up outputting literally "[get_fav]" and with the cleaning that should be converted to "0".
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It is working now. Like I say I'm not sure what changed. It was just outputting the [get_fav] for a while. Then suddenly started working. I've since added the input validation as you advised (don't want any injection attacks).