File included into functions.php via require_once() won’t echo?
I’m not sure why, but for some reason you have to use include() or require() inside form(), instead of include_once() and require_once(). I’m guessing that form() is being called multiple times, and so the external view file only gets included the first time. include_once() and require_once() will work fine inside widget(), but it’s still better … Read more