从PHP API插入MySQL数据

I am creating an API in PHP and I am stuck at a point where I need same data of one table into another.

In table one, the order ID is created by auto increment. I want to copy its order ID into the 2nd table order ID:

So a customer can add multiple items in same order:

I'm not sure if I understand your problem correctly. Are you asking how you can move data between two tables? Because if that's so, it's quite simple to do:

Let's suppose you want to move a record from table foo to table bar, you can use the query:

INSERT INTO `bar` (SELECT * FROM `foo` WHERE id = $some_id)

Where $some_id is the ID of the record you want to move.

But again, your question wasn't very clear, so apologies if this isn't what you were trying to do.