php cookies

Setting new cookie
=============================
<?php
setcookie("name","value",time()+$int);/*name is your cookie's name
value is cookie's value
$int is time of cookie expires*/?>
Getting Cookie
=============================
<?php echo $_COOKIE["your cookie name"];?>
Updating Cookie
=============================
<?php
setcookie("color","red");
echo $_COOKIE["color"];/*color is red*/
/* your codes and functions*/setcookie("color","blue");
echo $_COOKIE["color"];/*new color is blue*/?>
Deleting Cookie
==============================
<?php unset($_COOKIE["yourcookie"]);/*Or*/setcookie("yourcookie","yourvalue",time()-1);/*it expired so it's deleted*/?>
Reference: http://gencbilgin.net/php-cookie-kullanimi.html