I have a mysql table of discount codes (each one has a unique id)
When a users makes a post I want there to be a custom field where they enter this number.
Then if the custom field matches a unique id in the database then it will display the discount code. I know how to do this in PHP but when it comes to WP its a completely different story.
How can I do this in wordpress so that it shows the discount in the post itself?
I'm in 2.7. There's a bit near the bottom of the New Post/Edit Post page in the backend that says Add New Custom Field. Once you add it in that area, you can select the field from a dropdown box and assign a value on a per post basis.
Bookmarks