Is there a difference between calling a function in the php model and calling a function directly?

{Code...} first returns a count function to return the number of database entries. Return the correct value when calling this function directly. {Code...} but if it is called in this way, it will be all 0. Why? Are there any differences between the two methods? What should I do if I call it in the model?

First, this is a count function that returns the number of database entries. Return the correct value when calling this function directly.

 function index(){ $newsobj=M('news'); $newsnum=$newsobj->count(); //print_r ($newsnum); VIEW::assign(array('newsnum'=>$newsnum)); VIEW::display('admin/index.html'); }

However, if so, all the calls are 0. Why? Are there any differences between the two methods?
What should I do if I call it in the model?

Reply content:

First, this is a count function that returns the number of database entries. Return the correct value when calling this function directly.

 function index(){ $newsobj=M('news'); $newsnum=$newsobj->count(); //print_r ($newsnum); VIEW::assign(array('newsnum'=>$newsnum)); VIEW::display('admin/index.html'); }

However, if so, all the calls are 0. Why? Are there any differences between the two methods?
What should I do if I call it in the model?

The mode of the M function must implement the extends Model.

Count has already been implemented in the Model, so you don't have to write it aside. If you have to implement it yourself, you can use

Return $ this-> count ();

The subject can first understand the differences between the M method and the D method, and be familiar with the consistent operations of the tp framework. Avoid repeated methods.