当php提示不能把对象转换某种类型数据时的解决方法

php错误的提示如下：

Catchable fatal error: Object of class Paging could not be converted to string

错误语句而且如果你用zendstudio的还不提示错误：

$article=$this->db->selectArrs('select  blog_article.*,blog_class.name from blog_article left join blog_class  on (blog_article.typeid=blog_class.id)  order by  id desc  limit '.$this->Page->startPage . $this->Page-paging.' ;');

正确语句下：

$article=$this->db->selectArrs('select  blog_article.*,blog_class.name from blog_article left join blog_class  on (blog_article.typeid=blog_class.id)  order by  id desc  limit '.$this->Page->startPage . $this->Page->paging.' ;');

就是少了个>,被坑死了，发本帖提示自己需要注意