Summary of different usages of header in php (explanation with examples)_php examples

The editor below will share with you a summary of the different usages of the header in PHP (Explanation with examples). I believe that many students know from the beginning that the header in PHP is to declare the font encoding. Yes, then today is to break your previous understanding of the header in PHP. Let’s take a look!

1. The function of the header() function is: 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 responseStatus 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;;
?>

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