php setcookie时value为null或空字符串，会删除此cookie
长久以来，在php中删除cookie的时候，都是使用
bool setcookie ( string $name [, string $value [, int $expire = 0
[, string $path [, string $domain [, bool $secure = false [, bool
$httponly = false ]]]]]] )
$value 随便写， $expire设置为一个已经过去的时间即可。
官方文档中也是这样写的：
http://www.php.net/manual/en/function.setcookie.php
Example #2 setcookie() delete example
When deleting a cookie you should assure that the expiration date is in the past, to trigger the removal mechanism in your browser. Examples follow how to delete cookies sent in previous example:
<?php
// set the expiration date to one hour ago
setcookie ("TestCookie", "", time() - 3600);
setcookie ("TestCookie", "", time() - 3600, "/~rasmus/", "example.com", 1);
?>
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