PHP中header函数的用法及其注意事项详解_php实例
void header ( string $string [, bool $replace = true [, int $http_response_code ]] ) : Send a raw HTTP header
下面有一些使用header的几种用法:
1、使用header函数进行跳转页面;
header('Location:'.$url);
其中$url就是将要跳转的url了。
这种用法的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;
2、使用header声明content-type
header('content-type:text/html;charset=utf-8');
这个没有什么好说的;
3、使用header返回response 状态码
header(sprintf('%s %d %s', $http_version, $status_code, $description));
样式就是这样的;
例如:header('HTTP/1.1 404 Not Found');
4、使用header在某个时间后执行跳转
header("Refresh: {$delay}; url={$url}");
其中$delay就是推迟跳转的时间,$url为需要跳转的url
例如:header('Refresh: 10; url=http://www.example.org/'); 意思为10s后跳转到http://www.eexample.org这个网站
5、使用header控制浏览器缓存
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT"); header("Cache-Control: no-cache, must-revalidate"); header("Pragma: no-cache");
6、执行http验证
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Basic realm="Top Secret"');
7、使用header进行下载操作
header('Content-Type: application/octet-stream');//设置内容类型 header('Content-Disposition: attachment; filename="example.zip"'); //设置MIME用户作为附件下载 如果将attachment换成inline意思为在线打开 header('Content-Transfer-Encoding: binary');//设置传输方式 header('Content-Length: '.filesize('example.zip'));//设置内容长度 // load the file to send: readfile('example.zip');//读取需要下载的文件
下面再给大家介绍PHP header 的几种用法
跳转页面
header('Location:'.$url); //Location和":"之间无空格。
声明content-type
header('content-type:text/html;charset=utf-8');
返回response状态码
header('HTTP/1.1 404 Not Found');
在某个时间后执行跳转
header('Refresh: 10; url=http://www.baidu.com/'); //10s后跳转。
控制浏览器缓存
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");
执行http验证
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Basic realm="Top Secret"');
执行下载操作
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
header('Content-Transfer-Encoding: binary'); //设置传输方式
header('Content-Length: '.filesize('example.zip')); //设置内容长度

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