PHP gets the contents of TD in TABLE table

Question

I would like to ask everyone, a TABLE form is generated through the database. After the user inputs the data in the form, he wants to get the data entered by the user in the TD form and then save it back to the database. Now I am stuck on how to get the users in the table. Enter data here. Is there any way to get it using pure PHP? The table content has multiple rows and columns, and some may be