zend framework-从选择框中删除optgroup

| 在zend Framework中,你们如何从选择元素中删除optgroup? Zend默认将它们放置,但我不想要它。 我认为会有类似的选择 数组( \'optgroup \'=>否 )     
已邀请:
不要使用optgroup功能,请参见以下2个示例:
$form = new Zend_Form();
$form->addElement(\'select\', \'city\', array(
    \'label\' => \'Nested City List\',
    \'multiOptions\' => array(
        \'Jordan\' => array(
            \'ptr\' => \'Petra\',
            \'amm\' => \'Amman\',
        ),
        \'UAE\' => array(
            \'adb\' => \'Abu Dhabi\',
            \'dub\' => \'Dubai\'
        )
    )
));


$form->addElement(\'select\', \'city2\', array(
    \'label\' => \'Flat City List\',
    \'multiOptions\' => array(
        \'ptr\' => \'Petra\',
        \'amm\' => \'Amman\',
        \'adb\' => \'Abu Dhabi\',
        \'dub\' => \'Dubai\'
    )
));
    

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