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Modifying functions is actually adding functions. But why does it report an error when changing add to save?
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
Then, don’t use the add method in the video, but save, and add $data['id']=I('id'); in the modification method.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
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
Then, don’t use the add method in the video, but save, and add $data['id']=I('id'); in the modification method.