How to keep a record of changes to a custom field?

Question

I have a custom post type that hold real estate listings and I need to figure out a way to keep a record of the price of the property is listed for. For example a user lists a property for sale and then the user edits the property listing and changes the price. I need to show the price before and the new price and the date the price was changed. The price value is stored in a custom field. Doe anyone have any idea of how I can begin to tackle this issue.

I basically need to keep a record of a posts custom field and the date it was changed. If i can get an idea of how to code this I can post the code here for anyone who might find this useful.

Thanks

Answer 1

Your best option here is to create a second Custom Field and store an Array of all the versions that have been used together with the date of the update and the user who commited the changes, acually everything you need to know.

Hook into the save_post action and compare the Value of the Custom Field with the last Value of the "HistoryArray". If it is different, push another Element into the Array and update the HistoryArray.