为何json_encode()之后，数组里元素成空值

 $data           =   array("order_table" => $order_table,"html"=>$html);

eval("(" + xmlHttp.responseText + ")");

$data  =  json_decode($data);
print_r($data );

public function removeMenuItemAction(){
        $request = $this->getRequest();
        $layout = $this->_helper->layout();
        $layout->disableLayout();
        $this->_helper->viewRenderer->setNoRender(true);
        $menuId = $request->getParam('menuId', null);
        if( $menuId > 0 ){
            $SQLTool = new MysqlTool();
            $con = $SQLTool->getConnect();
            if( $con ){
                $sqlLineMenu = "select Id FROM menubar where Type=0";
                $resultMenu = mysql_query($sqlLineMenu);
                $rowMenubar = mysql_fetch_array($resultMenu,MYSQL_ASSOC);
                $menubarId = $rowMenubar['Id'];
                // remove his children
                $this->callBackMenuitemDelete($menuId,$menubarId);
                
                $sqlLine = "DELETE FROM menuitem WHERE Id = " . $menuId;
                mysql_query($sqlLine);
                mysql_close($con);
                echo json_encode(array('message'=>"删除成功"));
            }         
        }else{
            echo json_encode(array('message'=>"删除失败"));
        }
    }

------解决方案--------------------
这个不是多维数组的问题吧

感觉是含有 GB2312 的中文的原因

用UTF8

试试把HTML全部用英文或者UTF8格式，看看

PHP code

$data = array("order_table" => $order_table,"html" => iconv("GBK","UTF-8//IGNORE",$html));

------解决方案--------------------
PHP code

 $data           =   array("order_table" => $order_table,"html"=>$html);
exit(json_encode($data));

------解决方案--------------------
这种情况，只能是你手误了... $html 真的有东西？