php – header(“Location：/”); redirect适用于localhost,但不适用于远程服务器

if (condition)
{
#lol. Some code here
}
else
{       
header("Location:/");//i'm trying to redirect to the root
}

重定向在localhost上完美运行,但在远程服务器上运行不正常.
使用$_SERVER可能更好吗？
即使我选择与具有重定向的文件位于同一目录中的文件,此重定向也不起作用.
希望你帮帮我:)

从 manual：

HTTP/1.1 requires an absolute URI as argument to » Location: including the scheme,hostname and absolute path,but some clients accept relative URIs. You can usually use $_SERVER['HTTP_HOST'],$_SERVER['PHP_SELF'] and dirname() to make an absolute URI from a relative one yourself:

<?PHP
/* Redirect to a different page in the current directory that was requested */
$host  = $_SERVER['HTTP_HOST'];
$uri   = rtrim(dirname($_SERVER['PHP_SELF']),'/\\');
$extra = 'mypage.PHP';
header("Location: http://$host$uri/$extra");
exit;
?>