I am trying to figure out the correct code to select a certain user's email from my database on a page other than the page where the email was provided. For example: The user will enter their information on the registration page then once their payment is confirmed through paypal I am sending them a confirmation email in my thank you page using the mail function. What I cant figure out is how to select the correct email without having a variable to use in the WHERE portion of my query line. I have tried using SESSIONS but I keep getting an undefined variable error. If anyone can help I would be very grateful.