phpdoc classes

<?php
class Base
{
    protected $modelClass = null;

    /**
     * Send request
     *
     * @return Model
     */
    public function send()
    {
        return new $this->$modelClass();
    }
}

class Foo extends Base
{
    protected $modelClass = 'FooResponse';
}

class Model{}
class FooResponse extends Model {}
?>