Two inserts in PHP/MySQL using LAST_INSERT_ID() and rows from another table

Question

I am working on an events calendar using PHP and MySQL (V5.1) where the admin would add an event, and then an attendance list for that event would be created as well. I have

Answer 1

A couple of important points. First, if you getting your last insert ID you should execute LOCK and UNLOCK queries first:

• LOCK TABLES events WRITE;
• UNLOCK TABLES

Second, you can use the mysqli_insert_id() method to get the ID of the last insert. This means that you must have an AUTO_INCREMENT field in the table you are inserting.