In that case, you probably want to store the data in a database, and fetch it for the page when other users come to see it. The post page would just have to store it in the database. To differentiate your display pages from one another, I'd recommend adding a GET parameter to help the page find the right record in the database:
i.e.
Database:
ID, MFR, INFO
1, Lincoln, A good car
2, Example, A better car
Then, in your view post page, you could use a param like id:
view_post.php?id=1
which would run a sql command like:
SELECT * FROM cars WHERE ID=1;
and you could then use PHP to echo information to the page.