Cookie In A Form

Basically I have a form where the user enters their info (name, last name, email) then clicks the add button to store their info into an array that I made. Then, the user can enter say... "Bill" in the first name field, click the search button, and in the text box, all results with bill will show up.

What I need to do is instead of the information being stored in the array when the user clicks add, is to store it as a cookie with a comma separated string like this: "lastname,firstname,emailid"

Then when the users clicks the search button, the info is retrieved from a cookie, not the array.