php simple message board PC version

1. First create a database in mysql (for example, ly3), and then create a database table in the database. 2. Create the SQL statement for the database table. 3. After creating the database table, modify the class/database/lydb.class.php file. Others: This source code only completes the basic use of leaving messages. The administrator username is admin and the password is admin123. It is saved in classserviceauthority.class.php. The classserviceauthority.class.php file is used to check user identity and verify permissions. It is not implemented in this version and students can expand it by themselves.