Spot\Entity::__get PHP Method

    public function &__get($field)
    {
        $v = null;
        $camelCaseField = str_replace(' ', '', ucwords(str_replace('_', ' ', $field)));
        $getterMethod = 'get' . $camelCaseField;
        if (!in_array($field, $this->_inGetter) && method_exists($this, $getterMethod)) {
            // Custom getter method
            $this->_inGetter[$field] = true;
            $v = call_user_func([$this, $getterMethod]);
            unset($this->_inGetter[$field]);
        } else {
            // We can't use isset because it returns false for NULL values
            if (array_key_exists($field, $this->_dataModified)) {
                $v =& $this->_dataModified[$field];
            } elseif (array_key_exists($field, $this->_data)) {
                // if the value is an array or an object, copy it to dataModified first
                // and return a reference to that
                if (is_array($this->_data[$field])) {
                    $this->_dataModified[$field] = $this->_data[$field];
                    $v =& $this->_dataModified[$field];
                } elseif (is_object($this->_data[$field])) {
                    $this->_dataModified[$field] = clone $this->_data[$field];
                    $v =& $this->_dataModified[$field];
                } else {
                    $v =& $this->_data[$field];
                }
            } elseif ($relation = $this->relation($field)) {
                $v =& $relation;
            }
        }
        return $v;
    }