Sprig_Core::changed PHP Метод

    public function changed($field = NULL)
    {
        if ($field === NULL) {
            // Note that array_diff_assoc() can't be used here because it
            // assumes that any two array values are the same... WTF!
            $changed = $this->as_array();
            foreach ($changed as $field => $value) {
                if (!array_key_exists($field, $this->_changed)) {
                    unset($changed[$field]);
                }
            }
            return $changed;
        } else {
            return array_key_exists($field, $this->_changed);
        }
    }