<td><"a href=cart.php?ProductId=$row[ProductId]>Add Item</a></td>

Im trying to get the above code to transfer data from one page to another. I have different items for sale on the page, the information comes from a database and i want it to transfer all the data from a selected item onto the cart page.

I thought the above code would put a link on the page saying Add item, for each item then when i user clicks on the link it will take them to the cart page and i then want it to display the information for the item they selected.

I was also wondering what the code would be that i would put on the cart page to show the result. I want to be able to see three other fields in the database on the cart page aswell.

Look at using sessions.
PHP: Introduction - Manual

You can use this method also to transfer product id to cart page

<td><a href="cart.php?ProductId=<?php echo $row[ProductId]; ?>">Add Item</a></td>

Then on cart.php page you can get ProductId using $_REQUEST['ProductId'] variable and further run a database query using this id for other fields from table.

Hi All!

MizzHellz, if you want to implement a useful cart (which you can add 2 or more items), you will need to use sessions (as recommended by aschk).
Additionally you will be passing (HTTP variables) between pages (as recommended by ashish_mat1979).

But I warn you about the security of your application. Don't forget to sanitize all user input, be it taken from forms or urls.

For example, from the code recommended by ashish_mat1979, you should sanitize the ProductID like:
Casting the product id to integer avoids SQL Injection.

Beware of these pontetial threats to your application:
1. SQL Injection
2. Cross Site Scripting (XSS).

If you need more information about (web) application security, please let me know!

Cheers,
Leonel Machava