Header function usage

Introduction: This is a detailed page for using the header function. It introduces PHP, related knowledge, skills, experience, and some PHP source code.

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The header is the string sent by the server before the server passes HTML data to the browser with HTTP co-meaning.

Separate HTML files with a blank line. For more information about HTTP, see the RFC 2068 official file.

Http://www.w3.org/Protocols/rfc2068/rfc2068 ). Before sending HTML data back to PhP, you must first

All the headers are uploaded.

Note: The traditional header must contain one of the following three headers and can only appear once.

Content-Type: xxxx/YYYY

Location: xxxx: yyyy/zzzz

Status: NNN xxxxxx

The new multipart MIME type can appear more than twice.

Example

Example 1: In this example, the browser is redirected to the official PHP website.

Header ("Location: http://www.php.net ");

Exit;

>?

Example 2: to obtain the latest data every time, instead of the data in the proxy or cache, you can use the following Header

Header ("expires: Mon, 26 Jul 1997 05:00:00 GMT ");

Header ("last-modified:". gmdate ("D, D m y h: I: s"). "GMT ");

Header ("cache-control: No-cache, must-revalidate ");

Header ("Pragma: No-Cache ");

>?

Example 3: make the user's browser unable to find the file information.

Header ("status: 404 Not Found ");

>?

Example 4: allow users to download files.

Header ("Content-Type: Application/X-gzip ");

Header ("content-Disposition: attachment; filename = file name ");

Header ("content-Description: php3 generated data ");

>?

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