How to display data from the parent site to the child?

Question

PHP

Hi all. The bottom line is this:
There is a main site (parent), there are several child sites (copies of the parent). How to make it so that when changing information on the parent site, it would automatically change on the child?
Example:
The sites have a page with a description of the car, we change the price on the parent, it automatically changes on the child

Answer 1

With server and database

Answer 2

Create a common database, and display values ​​from the database instead of text.