php header函数的详解
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”;); |
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’ ); |
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 |
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 //设置一个404头: //设置地址被永久的重定向
|
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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