Description:
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Recently I did a wrapper for JSON_encode and JSON_decode, to deal with non UTF8 strings aswell, I tested them and didn't had any issue.

The problem came when I uploaded the code to my production server, which doesn't have the same php version as my development computer.

both JSON_encode and JSON_decode have signatures that added new parameters quite recently, so my server was expecting those calls with 1/2 parameters and when it seen 3 it went WTF?


I needed that code asap so instead of upgrading my server to the most recent version I just deleted the noisy parameters from the code (I was not really using them, just to make the wrappers more convinient in the future)

But then it came to my mind, it could be of great use a function which given reference to a function can tell (at least) how many parameters it expects.

Or even better, named parameters. Would solve funny issues like:

JSON_encode defines options parameter in 5.3.0 and depth in 5.5.0 and
JSON_decode defines options parameter in 5.4.0 and depth in 5.3.0


Anyway just an idea : )