Indeed, yes. No-one in their right mind would actively and intentionally execute passed code. Maybe I'm paranoid, but I won't have executable code coming in from the network under any circumstances. Before I'll accept it, it must be not capable of being executed. Accepting executable code and then trusting that it will never be called... erm...
Just seems to me that if you were going to attack a system you would look very closely at JSON and related parsing mechanisms because code is, by definition, already accepted. You're already half way there. In fact you have been supplied with a ready built framework for injecting your malice. After all, if it isn't runnable code it isn't JSON and PHP plus JSON seems like a perfect storm. It's just not likely to be failsafe. At least Perl can be made failsafe.
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