Is it possible to tell if something is urlencoded?

[jenni]

I have a funky situation that I won't bother explaining unless necessary. Basically, I need to urldecode a string but only if it has already been urlencoded. (decoding it if it has already been decoded wanks it out.)

Is there a way to tell if something is urlencoded?

[bpat1434]

Well, I guess you could technically see if any "non-alphanumeric or %" characters. If they do exist, then you dont' need to urldeocde. If you find a %XX group (where XX is hexadecimal), then chances are it's urlencoded.

Unfortunately, there isn't a "is_urlencoded" function out there 🙁 Sorry.

[NogDog]

I cannot think of a guaranteed way to tell. For instance, is "1+2" a urlencoded version of "1 2", or is it the urldecoded version of "1%2b2"?