Summary of usage of php header function

The header is a string sent by the server before transmitting HTML data to the browser using the HTTP protocol. A blank line is required between the header and the HTML file. In this article, we will share with you a summary of the different usages of headers in php.

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

header(string,replace,http_response_code) 
/*string：必需。规定要发送的报头字符串。
 replace：可选。指示该报头是否替换之前的报头，或添加第二个报头。
 默认是 true（替换）。false（允许相同类型的多个报头）。
 http_response_code：可选。把 HTTP 响应代码强制为指定的值。*/

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

2. Usage 1: Jump to the page

header("Location:https://baidu.com"); //正常跳转
header('Refresh: 3; url=https://www.baidu.com'); //3s后跳转
//在header作跳转时,避免发生错误后，代码继续执行，一般加个exit;

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

header('content-type:text/html;charset=utf-8');

Usage 3: Return response status Code

header('HTTP/1.1 403 Forbidden')

Usage 4: Perform download operation (hide file location)

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

Usage 5: Control browser cache

   
header( 'Expires: Mon, 26 Jul 1997 05:00:00 GMT' ); //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( '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' );

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;;
?>

The above content is a summary of the different usages of the header function in PHP. I hope it can help everyone.

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