Summary of usage of php header-PHP Tutorial-php.cn

Summary of usage of php header

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Release： 2023-03-18 07:08:01

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Today I will bring you a summary of the usage of headers in PHP. There are a total of 5 usages. Let’s explain them one by one in detail. Let’s take a look at them together.

1. The function of the header() function is to send an original HTTP header [Http Header] to the client.

header(string,replace,http_response_code)

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/*string: required. Specifies the header string to be sent.

replace: optional. Indicates whether this header replaces the previous header, or adds a second header.

The default is true (replacement). false (allow multiple headers of the same type).

http_response_code: Optional. Forces the HTTP response code to the specified value. */

Note: The header() function must be called before any actual output is sent.

2. Usage 1: Jump page

header("Location:https://baidu.com"); //正常跳转
header(&#39;Refresh: 3; url=https://www.baidu.com&#39;); //3s后跳转

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//When the header is jumped, to avoid the error, the code continues to execute, usually add an exit;

Usage 2: Declare content-type (I often use it to solve garbled characters)

header(&#39;content-type:text/html;charset=utf-8&#39;);

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Usage 3: Return response status Code

header(&#39;HTTP/1.1 403 Forbidden&#39;);

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Usage 4: Perform download operation (hide file location)

header(&#39;Content-Type: application/octet-stream&#39;); //设置内容类型
header(&#39;Content-Disposition: attachment; filename="example.zip"&#39;);//设置MIME用户作为附件
header(&#39;Content-Transfer-Encoding: binary&#39;); //设置传输方式
header(&#39;Content-Length: &#39;.filesize(&#39;example.zip&#39;)); //设置内容长度

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Usage 5 : Control browser cache

header( &#39;Expires: Mon, 26 Jul 1997 05:00:00 GMT&#39; ); //如果服务器上的网页经常变化，就把它设置为-1，表示立即过期
header( &#39;Last-Modified: &#39; . gmdate( &#39;D, d M Y H:i:s&#39; ) . &#39; GMT&#39; );
header( &#39;Cache-Control: no-store, no-cache, must-revalidate&#39; );
header( &#39;Cache-Control: post-check=0, pre-check=0&#39;, false );
header( &#39;Pragma: no-cache&#39; );

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Usage 6:

3. More examples

<?php
// ok
header(&#39;HTTP/1.1 200 OK&#39;);
//设置一个404头:
header(&#39;HTTP/1.1 404 Not Found&#39;);
//设置地址被永久的重定向
header(&#39;HTTP/1.1 301 Moved Permanently&#39;);
//转到一个新地址
header(&#39;Location: http://www.example.org/&#39;);
//文件延迟转向:
header(&#39;Refresh: 10; url=http://www.example.org/&#39;);
print &#39;You will be redirected in 10 seconds&#39;;
//当然，也可以使用html语法实现
// <meta http-equiv="refresh" content="10;http://www.example.org/ />
// override X-Powered-By: PHP:
header(&#39;X-Powered-By: PHP/4.4.0&#39;);
header(&#39;X-Powered-By: Brain/0.6b&#39;);
//文档语言
header(&#39;Content-language: en&#39;);
//告诉浏览器最后一次修改时间
$time = time() - 60; // or filemtime($fn), etc
header(&#39;Last-Modified: &#39;.gmdate(&#39;D, d M Y H:i:s&#39;, $time).&#39; GMT&#39;);
//告诉浏览器文档内容没有发生改变
header(&#39;HTTP/1.1 304 Not Modified&#39;);
//设置内容长度
header(&#39;Content-Length: 1234&#39;);
//设置为一个下载类型
header(&#39;Content-Type: application/octet-stream&#39;);
header(&#39;Content-Disposition: attachment; filename="example.zip"&#39;);
header(&#39;Content-Transfer-Encoding: binary&#39;);
// load the file to send:
readfile(&#39;example.zip&#39;);
// 对当前文档禁用缓存
header(&#39;Cache-Control: no-cache, no-store, max-age=0, must-revalidate&#39;);
header(&#39;Expires: Mon, 26 Jul 1997 05:00:00 GMT&#39;); // Date in the past
header(&#39;Pragma: no-cache&#39;);
//设置内容类型:
header(&#39;Content-Type: text/html; charset=iso-8859-1&#39;);
header(&#39;Content-Type: text/html; charset=utf-8&#39;);
header(&#39;Content-Type: text/plain&#39;); //纯文本格式
header(&#39;Content-Type: image/jpeg&#39;); //JPG图片
header(&#39;Content-Type: application/zip&#39;); // ZIP文件
header(&#39;Content-Type: application/pdf&#39;); // PDF文件
header(&#39;Content-Type: audio/mpeg&#39;); // 音频文件
header(&#39;Content-Type: application/x-shockwave-flash&#39;); //Flash动画
//显示登陆对话框
header(&#39;HTTP/1.1 401 Unauthorized&#39;);
header(&#39;WWW-Authenticate: Basic realm="Top Secret"&#39;);
print &#39;Text that will be displayed if the user hits cancel or &#39;;
print &#39;enters wrong login data&#39;;
?>

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I believe you have mastered it after reading these cases For more exciting methods, please pay attention to other related articles on the php Chinese website!