It is not to say that after users register, they should create tables for each user, but to create these tables. Data is added to these tables every time a user registers. What fields do you need for each table? Is the so-called database design.

In addition, it is very convenient for php to connect mysql, and they are all functions. For example, mysql_connect is to connect to the database server, mysql_select_db is to select the database, and mysql_query is to execute the query command. But making a system is not too simple, and it still needs to be based on php and mysql.