Detailed explanation of header definition in php

I believe everyone knows what the header means when they see the title. It is to send the original HTTP header to the client. This article mainly gives you a summary of the header definitions commonly used in PHP. It is very comprehensive and detailed. Friends who need it can refer to it.

It's important to realize that the header() function must be called before any actual output is sent (in PHP 4 and above, you can use output caching to solve this problem):

header('HTTP/1.1 200 OK'); // ok 正常访问
header('HTTP/1.1 404 Not Found'); //通知浏览器 页面不存在
header('HTTP/1.1 301 Moved Permanently'); //设置地址被永久的重定向 301
header('Location: http://www.ithhc.cn/'); //跳转到一个新的地址
header('Refresh: 10; url=http://www.ithhc.cn/'); //延迟转向 也就是隔几秒跳转
header('X-Powered-By: PHP/6.0.0'); //修改 X-Powered-By信息
header('Content-language: en'); //文档语言
header('Content-Length: 1234'); //设置内容长度
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $time).' GMT'); //告诉浏览器最后一次修改时间
header('HTTP/1.1 304 Not Modified'); //告诉浏览器文档内容没有发生改变

Content type

header('Content-Type: text/html; charset=utf-8'); //网页编码
header('Content-Type: text/plain'); //纯文本格式
header('Content-Type: image/jpeg'); //JPG、JPEG 
header('Content-Type: application/zip'); // ZIP文件
header('Content-Type: application/pdf'); // PDF文件
header('Content-Type: audio/mpeg'); // 音频文件 
header('Content-type: text/css'); //css文件
header('Content-type: text/javascript'); //js文件
header('Content-type: application/json'); //json
header('Content-type: application/pdf'); //pdf
header('Content-type: text/xml'); //xml
header('Content-Type: application/x-shockw**e-flash'); //Flash动画

Declare a downloaded file

header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="ITblog.zip"');
header('Content-Transfer-Encoding: binary');
readfile('test.zip');

Disable caching for the current document

header('Cache-Control: no-cache, no-store, max-age=0, must-revalidate');
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');

Display a login dialog box that requires verification

header('HTTP/1.1 401 Unauthorized'); 
header('WWW-Authenticate: Basic realm="Top Secret"');

Declare an xls file that needs to be downloaded

header('Content-Disposition: attachment; filename=ithhc.xlsx');
header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
header('Content-Length: '.filesize('./test.xls')); 
header('Content-Transfer-Encoding: binary'); 
header('Cache-Control: must-revalidate'); 
header('Pragma: public'); 
readfile('./test.xls');

Summary:

This article introduces several forms of header definition in php. Friends can choose according to the needs of their own projects. Each definition has a different meaning, don’t get confused, I hope it helps!

Related recommendations:

Explanation on how to use the PHP header function

Cause analysis and solutions for PHP Header failure

Detailed analysis of PHP header jump

Detailed explanation of the example of setting the http message header by the PHP header function

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