I\'ve tried searching the php manual and internet on how to delete cookies and I\'ve tried it the exact same way they all say:
setcookie(\"name\", \'\', 1);
I'm surprised no one has posted this yet, but this works perfectly for me:
To CREATE or CHANGE cookie by name:
$_COOKIE['myCookieName'] = 'I can be changed to whatever u want';
To DELETE a cookie by name:
unset($_COOKIE['myCookieName']);