Description:
------------
---
From manual page: https://php.net/function.array-column
---
The first parameter describes: 
A multi-dimensional array or an array of objects from which to pull a column of values from. If an array of objects is provided, then public properties can be directly pulled. In order for protected or private properties to be pulled, the class must implement both the __get() and __isset() magic methods.
But I think if object's class implements interface \ArrayAccess, no need to define magic methods (set, get, isset) for allowing them to be used in array-management functions: like array_columns. I mean that Array*** interfaces can be enough (I will prefer required) to use objects or object arrays in array_*** functions.

Test script:
---------------
class SimpleArrayLikeClass implements \ArrayAccess
{
    public function offsetExists($name)
    {
        return array_key_exists($name, $this->attributes());
    }

    public function offsetGet($name)
    {
        return $this->attributes()[$name] ?? null;
    }

    // if object need to be used as array this 2 methods need to be used instead of __isset() and __get() 
}

Expected result:
----------------
In future versions became deprecated to use objects as array, if they not implemented Array*** interfaces, instead of magic methods