php清空cookie的困难

[Abandonee]

if ($action == "logout"):
logout();
exit;
endif;
$cookie_name = "my_amani";
//在该页面用./xxxx.php?action=logout 调用该函数

函数内容:
function logout()
{
global $cookie_name;
// cookie名称用函数定义,函数值为 $cookie_name = "my_amani";
setcookie ($cookie_name."[1]",'');
setcookie ($cookie_name."[2]",'');

echo "<META HTTP-EQUIV=REFRESH CONTENT='0;URL=index.php'>";
// 清空cookie后返回到index.php页
exit;
}

现在问题是
setcookie ($cookie_name."[1]",'');
setcookie ($cookie_name."[2]",'');
出错,不能清空cookie...
一定是我哪儿写错了,帮找找...

[飞扬]

setcookie ($cookie_name."[1]",'',time()-3600);
setcookie ($cookie_name."[2]",'',time()-3600);

[xuzuning]

setcookie ($cookie_name."[1]",'');
写的不错！

确认$action 有值

[hgh198345]

function logout()
{
print_r($HTTP_COOKIE_VARS);
exit;
//看看有没有你要清空的COOKIE
global $cookie_name;
// cookie名称用函数定义,函数值为 $cookie_name = "my_amani";
setcookie ($cookie_name."[1]",'');
setcookie ($cookie_name."[2]",'');

echo "<META HTTP-EQUIV=REFRESH CONTENT='0;URL=index.php'>";
// 清空cookie后返回到index.php页
exit;
}