无效的 arugement foreach(）， NULL 数组

控制器代码：

public function searchAction() //search action for items
{ 
    $form = new Application_Form_Search(); //pass through search form
    $form->submit->setLabel('Search Item!'); //set submit button as 'Search item!'

    $this->view->form = $form; //pass to search.phtml
    if ($this->getRequest()->isPost()) {    //Check if 'Submit' button is clicked
         $formData = $this->getRequest()->getPost(); //Checking the values from the 'Submit' button
         if ($form->isValid($formData)) {    //Check if form is valid
            $item = new Application_Model_Item($form->getValues());  //Plug in values into item object  
            $db = new Application_Model_DbTable_Item(); //Create an item object for DbTable_Item              
            $db->searchItem($item->getName()); //search item in DbTable_Item via the searchItem
            $this->_helper->redirector->gotoSimple('search', 'item' );

        } else {
           //If the data is not valid, redisplay the information on the form so that 
           //the user can correct appropriately.
            $form->populate($formData);  
        }
    }

}

表单代码：

<?php
    class Application_Form_Search extends Zend_Form
    {
        public function init()
        {
        $this->setName('search');
        $search = new Zend_Form_Element_Submit('submit');
        $search->setLabel('Search');
        $search->setAttrib('itemname', 'submitbutton');
        $itemname = new Zend_Form_Element_Text('itemname'); //create text box for stock
        $itemname->setLabel('Search Item Name:')
        ->setRequired(true)
        ->addFilter('StripTags')
        ->addFilter('StringTrim')
        ->addValidator('Alpha')
        ->addValidator('NotEmpty');  
        //$list->setLabel('List');      
        //remember to add the declare form elements to form
        $this->addElements(array($itemname, $search));  
        }
    }

型号代码：

    public function searchItem($itemname) //search item based on itemname
    {
        $itemname = (string)$itemname; //let itemid to be integer
       // $sql = 'SELECT * FROM item WHERE `itemname` LIKE ?';
        //$row = $this->fetchRow('itemname LIKE % . $itemname . %'); //find Row based on itemid
        //$row = $this->fetchRow($sql, '%'.$itemname.'%');
        $select = $this->select() //select from usertable and memberdetail
        ->from(array('item')) //join memberdetail and usertable through memberid = username
        ->where('itemname LIKE "%?%"', $itemname);
        $row = $this->fetchAll($select);
        if (!$row) { //if row can't be found
            throw new Exception("Could not find row $itemname"); //Catch exception where itemid is not found

        }
        return $row->toArray();
    }
foreach:
    <?php var_dump($this->item); ?>
    <?php foreach($this->item as $item) : ?>
        <?php echo $this->escape($item['itemid']);?>
        <?php echo $this->escape($item['image']);?>
        <?php echo $this->escape($item['itemname']);?>
        <?php echo $this->escape($item['description']);?>
        <?php echo $this->escape($item['itemtype']);?>
    <?php endforeach; ?>

嗨，我试图做一个搜索页面，但我不断收到foreach（）错误。做了一个var_dump，它说空。想知道我哪里做错了。在决定向你们寻求帮助之前，在同一个问题上停留了几个小时。