Zend 1.12：Zend_Form_Element_Text默认值

Question

我正在尝试创建文本输入的子表单数组，但我无法设置默认值。

foreach ($products as $product) {
    $this->products[$product['product_id']] = $product;
    $product['amount']=0;
    $element = new Zend_Form_Element_Text(array(
        'name' => 'products[' . $product['product_id'] . ']',
            'id' => $product['product_id'],
            'label' => $product['name'],
            'class' => 'product-amount',
            'filters' => array('StringTrim'),
            'decorators' => array('Label', 'ViewHelper'),
            'validators' => array('Digits')
            ));
    $element->setValue("0");
}