标头 (header) 是服务器以 HTTP 协义传 HTML 资料到浏览器前所送出的字串,在标头
与 HTML 文件之间尚需空一行分隔。有关 HTTP 的详细说明,可以参 RFC 2068 官方文件
(http://www.w3.org/Protocols/rfc2068/rfc2068)。在 PHP 中送回 HTML 资料前,需先
传完所有的标头。
注意: 传统的标头一定包含下面三种标头之一,并只能出现一次。
Content-Type: xxxx/yyyy
Location: xxxx:yyyy/zzzz
Status: nnn xxxxxx
在新的多型标头规格 (Multipart MIME) 方可以出现二次以上。
使用范例
范例一: 本例使浏览器重定向到 PHP 的官方网站。
Header("Location: http://www.php.net");
exit;
>?
范例二: 要使用者每次都能得到最新的资料,而不是 Proxy 或 cache 中的资料,可以使用下列的标头
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
>?
范例三: 让使用者的浏览器出现找不到档案的信息。
header("Status: 404 Not Found");
>?
范例四:让使用者下载档案。
header("Content-type: application/x-gzip");
header("Content-Disposition: attachment; filename=文件名");
header("Content-Description: PHP3 Generated Data");
>?

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