Php uses the header to set content-type and content-type of common file types. in PHP, you can use the header function to send header information, or set the content-type of the file, the following describes the content-type values of common file types.
// Date 2015-06-22 // define the encoding header ('content-Type: text/html; charset = utf-8 '); // Atomheader ('content-type: application/atom + XML'); // CSSheader ('content-type: text/css '); // Javascriptheader ('content-type: text/javascript '); // JPEG Imageheader ('content-type: image/jpeg '); // JSONheader ('content-type: application/json'); // response header ('content-type: application/pdf '); // RSSheader ('content-Type: application/rss + xml; charset = ISO-8859-1'); // Text (Plain) header ('content-type: text/plain '); // XMLheader ('content-type: text/XML'); // okheader ('http/1.1 200 OK '); // set a 404 header: header ('http/1.1 404 Not Found '); // Set the address to be Permanently redirected header ('http/1.1 301 Moved Permanently '); // go to a new address header ('Location: http://www.example.org/'); // File delay redirection: header ('refresh: 10; url = http://www.example.org /'); print 'You will be redirected in 10 seconds '; // of course, You can also use html syntax to implement //