title: Is it possible to change the value of a cookie and leave the expiration date the same in PHP?
body: <p>Say I have a PHP script that creates a cookie that expires 10 days from now. Is there any way to use PHP to update the value and maintain the same expiration date? </p>
  
  <p>For example, say my cookie is created today with a value of "foo" and expires on 3/13/10. Two days from now, I want to change the value to "bar". Can I still have the cookie expire on the thirteenth or am I forced to either expire the cookie immediately or extend it another 10 days?</p>