Zend MultiSelect框选项未显示

Question

我正在为网站编制折扣，我遇到了multiSelect框选项的问题。我试图通过硬编码获得价值，例如：

   $elements['apply_to'] = new \Zend_Form_Element_Multiselect('apply_to');
    $elements['apply_to']->setMultiOptions(
        array(
            'iframe' => $translate->_('apply_to_iframe'),
            'iframer' => $translate->_('apply_to_iframer'),
            'unregistered' => $translate->_('apply_to_unregistered'),
            'person' => $translate->_('apply_to_person'),
            'agency' => $translate->_('apply_to_agency')
        )
    );

    $elements['apply_to']->setLabel('apply_to')
        ->setView($view)
        ->setRequired(true)
        ->addFilter('StripTags')
        ->addFilter('StringTrim')
        ->addValidator(new \Zend_Validate_NotEmpty(\Zend_Validate_NotEmpty::PHP))
        ->setAttribs(array(
            'translate' => $translate
        ))
        ->setDecorators(
            array(
                array('ViewScript',
                    array(
                        'viewScript' => 'Components/Forms/Elements/Multiselect.phtml'
                    )
                )
            )
        );

从db模型中获取值：

$elements['apply_to'] = new \Desk\Components\Forms\Elements\Multiselect('apply_to');
    $elements['apply_to']->setMultiOptions(\Desk\Models\Discounts::getApplyTo($translate));
    $elements['apply_to']->setLabel('apply_to')
        ->setView($view)
        ->setAttribs(array(
            'translate' => $translate
        ))
        ->setDecorators(
            array(
                array('ViewScript',
                    array(
                        'viewScript' => 'Components/Forms/Elements/Multiselect.phtml'
                    )
                )
            )
        );

其中getApplyTo是：

public static function getApplyTo($translate, $not_deleted = false){
    $db = new \Db\Users();
    if ($not_deleted) {
        $rows = $db->fetchAll(array('deleted IS NULL'));
    } else {
        $rows = $db->fetchAll();
    }
    $return = array();

    if (count($rows) > 0) {
        $rows = $rows->toArray();
        foreach ($rows as $row) {
            $return[ $row['user_type'] ] = $row['user_type'];
        }
    }
    return $return;
}

但是没有一个例子可行。任何人都可以帮助我吗？