Another way to write the exchangeArray method of the Model Class in ZF2

Foo.php

<?php
// Please read the comments below in this Gist carefully as this approach has very important caveats.

namespace Application\Model;

class Foo
{
    public $id;
    public $bar;
    public $baz;
    public $quux;

    public function exchangeArray($data)
    {
        $attributes = array_keys(get_class_vars(__CLASS__));

        foreach($attributes as $attribute) {
            if (isset($data[$attribute])) {
                $this->$attribute = (!empty($data[$attribute]) ? $data[$attribute] : null);
            }
        }
    }
}

@harikt Ah, of course, isset would work. Been a long day of work, missed that =)