php do a questionnaire

Question

How to use PHP to implement the nested sub-questions under the questions in the questionnaire and the automatic saving function when leaving the page midway

Answer 1

Refer to the method of ue editor, you can save the content to localstorage regularly. It is easy to find out how to serialize the form and how to operate localstorage.

For example: The post in Tieba has not been posted, and the content will still be there next time you open it

Answer 2

Can be saved in real time, novices can use ajax to submit data and save it