Let's see if there's a problem with this simple piece of code.

    Private Function GetUserInfo (callable $Human)    {        try {            $users = (new $Human)->getuser () [' users '];            $underageUsers = [foreach ($users as $user) if ($user->age <) yield $user];                        List ($userNames, $ages) = Array_map (                function ($value) {return Array_column ($value, Array (' UserNames ', ' ages '), Default),                 mb_convert_encoding ($underageUsers, ' utf-8 ', ' GBK ')            );                        return [' name ' = $userNames, ' surname ' = ' $ages];        } catch (Exception $e) {            error_log ($e);        }    }

Reply to discussion (solution)

What is callable? Give a definition!

Callable is a cue placeholder.
Description parameter is a resource body that can be called

This code is really stylish, a bunch of PHP 5.5 features.

$underageUsers is an array, when mb_convert_encoding can accept an array as a parameter.

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