Stupid question, who actually checks for E_* in his code at runtime after having called such functions? Not me and I would hate to. It sounds to me like a perfect exception use case. As this function can
General policy in PHP as far as I know is that non-OO functions do not do exceptions.
return nearly everything scalar we have (boolean, string, null, integer,...) we can't use our normal "returns FALSE on failure".
This function can return only a string, but I'm not sure returning false if somewhere in some value deep down your data is some bad utf-8 is warranted. It is doable, though, but I'm afraid most of current code never check for return of json_encode() so they are in for big surprises when json_encode won't produce valid JSON.
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