Fatal error: Call to a member function assign() on a non-object

Posted 2023-05-08

Fatal error: Call to a member function assign() on a non-object in D:\webs\www\web2\application\controllers\back\indexAction.php on line 28
我刚自己写了一个phpmvc的框架，我在后台做了视图类，采用单例模式，用的是smarty模板，然后在后台对应控制器里边直接使用，将对应数据模型调用之后，出现了这个问题，请问这是为什么？望高手解答，谢谢！
代码如下：
后台视图类
class viewBackLib

private static $viewBack = null;

public static function getInstance()
if(self::$viewBack == null)
include 'smarty/Smarty.class.php';
$smarty = new Smarty();
$smarty->template_dir = ROOT.'views'.DS.'manage';
$smarty->compile_dir = ROOT.'public'.DS.'template_c';
$smarty->cache_dir = ROOT.'public'.DS.'cache_back';
$smarty->left_delimiter = '<!-- ';
$smarty->right_delimiter= ' -->';
$smarty->assign('VUrl',ServerName.'/web2/views/manage/');//注册视图路径
self::$viewBack = $smarty;
return $smarty;

else
return self::$viewBack;




这是后台的左侧菜单模型
class menusModel

public function menuList()

$menuArr[] = DBLib::fetchAll("select M_id,M_name from ".TABPX."manmenus where M_pId = 0 order by M_order", array());
$menuArr[] = DBLib::fetchAll("select M_id,M_pId,M_name,M_a,M_m from ".TABPX."manmenus where M_pId != 0 order by M_order", array());
return $menuArr;


//下拉菜单构成
public function getOptions($seleted=null)

$arr = DBLib::fetchAll("select M_id,M_name from ".TABPX."manmenus where M_pId = 0 order by M_order", array());

foreach ($arr as $rowsCa)
$option[$rowsCa['M_id']] = $rowsCa['M_name'];


$reoptions = '';

foreach ($option as $key=>$values)
$seT = '';
if($seleted != null)
if($seleted == $key)
$seT = ' selected="selected"';


$reoptions .= '<option value="'.$key.'"'.$seT.'>'.$values.'</option>
';

return $reoptions;



最后一个是后台首页控制器
class indexAction

public function index()
$views = viewBackLib::getInstance();
$views->display('index.html');


public function top()
$views = viewBackLib::getInstance();
$views->assign('session',$_SESSION);
$views->display('index_top.html');

public function left()
$views = viewBackLib::getInstance();
$views->caching = true;
$views->cache_lifetime = 3600;
if(!$views->isCached('index_left.html'))
/* 获取菜单数组 */
$menuMObj = new menusModel(pdoLib::getInstance());
$arrMenuList = $menuMObj->menuList();
foreach ($arrMenuList[1] as $ddrows)

$ddMenus[$ddrows['M_pId']][$ddrows['M_id']] = $ddrows['M_name'];
$ddlink[$ddrows['M_id']] = '?a='.$ddrows['M_a'].'&m='.$ddrows['M_m'];

$view->assign('menuArr',$arrMenuList[0]);
$view->assign('ddMenus',$ddMenus);
$view->assign('ddlink',$ddlink);

$view->display('index_left.html');


求高手指点！万分谢谢！！！

父类Controller里边是有一个构造函数的，我只知道你这样定义你的构造函数肯定会报错，不过具体是不是这个错误我忘记了，解决办法是：在你的构造函数的function的第一行加入代码parent::__construct();//执行父类的构造函数，否则会被覆盖的。 参考技术A 因为函数里要使用函数外的变量 要加global 这样你函数内的$smarty对象才是全局变量$smarty

function a()
global $smarty;
$a="ee";
$smarty->assign('a',$a);

a();
$smarty->display('ce.html');
?>
本回答被提问者和网友采纳

Fatal error: Call to a member function rowCount() on a non-object in /opt/lampp/htdocs/xampp/assets/

 $sql = "SELECT * from idea ORDER BY datetime DESC LIMIT 50;";
$result = $pdo->query($sql);

if($result->rowCount() > 0 && !empty($result)) // line 6
    {
        foreach ($result as $row) 
        {
        $id = $row[‘id‘];
        $title = $row[‘title‘];
        $idea = $row[‘idea‘];

        echo ‘<span class="idea" id="‘.$id.‘"><strong style="color: #0081C5">‘ . $title . "</strong> - " . $idea . ‘ <a class="delete" href="#">[Delete]</a></span>‘;
        }
    }
一般如果你的sql语句查询出现错误时，没有进行$result 的判断，直接使用$result -> rowCount()会出现这种错误。