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php header函数的详解

Jun 13, 2016 am 11:19 AM
header php information function Can exist head us yes of Detailed explanation

header函数在php中是发前一些头部信息的,如果我们可以直接使用它来做301跳转等,下面我来总结关于header函数用法与一些常用见问题解决方法。  

发送一个原始 HTTP 标头[Http Header]到客户端。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

例1

 代码如下 复制代码

Header(“Location: http://www.bkjia.com”;);
exit; //在每个重定向之后都必须加上“exit”,避免发生错误后,继续执行。
?>

禁止页面在IE中缓存

 代码如下 复制代码

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-store, no-cache, must-revalidate’ );
header( ‘Cache-Control: post-check=0, pre-check=0′, false );
header( ‘Pragma: no-cache’ ); //兼容http1.0和https
?>
CacheControl = no-cache
Pragma=no-cache
Expires = -1

实现文件下载

 代码如下 复制代码

header('Content-Type: application/octet-stream');//设置内容类型
header('Content-Disposition: attachment; filename="example.zip"'); //设置MIME用户作为附件下载 如果将attachment换成inline意思为在线打开
header('Content-Transfer-Encoding: binary');//设置传输方式
header('Content-Length: '.filesize('example.zip'));//设置内容长度
  // load the file to send:
readfile('example.zip');//读取需要下载的文件

php的函数header()可以向浏览器发送Status标头
如 

 代码如下 复制代码
header(”Status: 404 Not Found”)。

但是我发现实际上浏览器返回的响应却是:

 代码如下 复制代码

// ok
header(‘HTTP/1.1 200 OK’);

//设置一个404头:
header(‘HTTP/1.1 404 Not Found’);

//设置地址被永久的重定向
header(‘HTTP/1.1 301 Moved Permanently’);


HTTP/1.x 200 OK
Date: Thu, 03 Aug 2006 07:49:11 GMT
Server: Apache/2.0.55 (Win32) PHP/5.0.5
X-Powered-By: PHP/5.0.5
Status: 404 Not Found
Content-Length: 0
Keep-Alive: timeout=15, max=98
Connection: Keep-Alive
Content-Type: text/html

注意事项有以下几点:

•Location和":"之间不能有空格,否则会出现错误(注释:我刚测试了,在我本地环境下,没有跳转页面,但是也没有报错,不清楚什么原因);
•在用header前不能有任何的输出(注释:这点大家都知道的,如果header之前有任何的输出,包括空白,就会出现header already sent by xxx的错误);
•header 后面的东西还会执行的;


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