There is a bug in the modification function

Question

Modifying functions is actually adding functions. But why does it report an error when changing add to save?

Answer 1

The teacher's modification is wrong. The add method is only added and not modified. Here is the correct method for students who may see it later:

First, set the hidden field of the article id on the article editing page<input type="hidden" name="id" value="{$articler .id}">

Then, don’t use the add method in the video, but save, and add $data['id']=I('id'); in the modification method.