所以我有点问题。
在我的网站上，用户登录主页，他们可以在网站内注销。
现在，用户可以登录，然后重新登录。当他们登录时，会设置cookie，当他们注销时，cookie将被删除。
但是，如果他们登录（设置了cookie），注销（删除了cookie），再次登录（再次设置cookie），并尝试再次注销，则不会删除cookie。
知道为什么会这样吗？
以下是我用来设置Cookie并删除Cookie的代码：
SET COOKIES：
<?php
...code to get the variables used below (database query)
setcookie("Email", $user_info['Email'], time()+1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("First_Name", $user_info['First_Name'], time()+1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("Last_Name", $user_info['Last_Name'], time()+1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("Full_Name", $user_info['First_Name']." ".$user_info['Last_Name'], time()+1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("User_Type", $user_info['User_Type'], time()+1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("Do_Not_Show_Modals", $user_info['Do_Not_Show_Modals'], time()+1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("Org_ID", $user_info['Company_ID'], time()+1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("Org_Name", $user_info['Org_Name'], time()+1209600, '/', $_SERVER['SERVER_NAME']);
header("Location: Inside_the_site");
?>
删除COOKIES
<?php
unset($_COOKIE['Email']);
unset($_COOKIE['First_Name']);
unset($_COOKIE['Last_Name']);
unset($_COOKIE['Full_Name']);
unset($_COOKIE['User_Type']);
unset($_COOKIE['Do_Not_Show_Modals']);
unset($_COOKIE['Org_ID']);
unset($_COOKIE['Org_Name']);
unset($_COOKIE['_ga']);
setcookie("Email", "DELETE", time()-1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("First_Name", "DELETE", time()-1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("Last_Name", "DELETE", time()-1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("Full_Name", "DELETE", time()-1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("User_Type", "DELETE", time()-1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("Do_Not_Show_Modals", "DELETE", time()-1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("Org_ID", "DELETE", time()-1209600, '/', $_SERVER['SERVER_NAME']);
setcookie("Org_Name", "DELETE", time()-1209600, '/', $_SERVER['SERVER_NAME']);
header("Location: https://www.homepage.com");
?>