Remove a cookie

Question

When I want to remove a Cookie I try

unset($_COOKIE[\'hello\']);

I see in my cookie browser from firefox that the cookie still exists. How

Answer 1

This is how PHP v7 setcookie() code works when you do:

From the output of tcpdump while sniffing on the port 80, the server sends to the client (Browser) the following HTTP headers:

Set-Cookie: user_id=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0
Set-Cookie: session=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0

Observing packets in the following requests the Browser no longer sends these cookies in the headers