How to set content-type in php

In PHP, you can use the header() function to set the content-type (content type), which can send the original HTTP header to the client, the syntax "header('Content-type: type value' );".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Content-Type (content type), usually Refers to the Content-Type that exists in the web page, which is used to define the type of network file and the encoding of the web page, and determines in what form and what encoding the browser will read the file. This is why we often see some PHP web pages clicked but the result is downloading. The reason for a document or a picture.

The Content-Type header tells the client the content type of the actual content returned.

In PHP, you can send header information through the header() function, and you can also set the content-type of the file. Here is a list of content-type values ​​for some common file types.

//定义编码  
header( 'Content-Type:text/html;charset=utf-8 ');  
  
//Atom  
header('Content-type: application/atom+xml');  
  
//CSS  
header('Content-type: text/css');  
  
//Javascript  
header('Content-type: text/javascript');  
  
//JPEG Image  
header('Content-type: image/jpeg');  
  
//JSON  
header('Content-type: application/json');  
  
//PDF  
header('Content-type: application/pdf');  
  
//RSS  
header('Content-Type: application/rss+xml; charset=ISO-8859-1');  
  
//Text (Plain)  
header('Content-type: text/plain');  
  
//XML  
header('Content-type: text/xml');  
  
// ok  
header('HTTP/1.1 200 OK');  
  
//设置一个404头:  
header('HTTP/1.1 404 Not Found');  
  
//设置地址被永久的重定向  
header('HTTP/1.1 301 Moved Permanently');  
  
//转到一个新地址  
header('Location: http://www.example.org/');  
  
//文件延迟转向:  
header('Refresh: 10; url=http://www.example.org/');  
print 'You will be redirected in 10 seconds';  
  
//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***  
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-shockw**e-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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