Phpheader () function

Header (string, replace, http_response_code) string is required. the required header string replace is optional, indicating whether to replace the previous header or add a second header.

Header (string, replace, http_response_code)

String is required, which specifies the header string to be sent.

Optional. indicates whether to replace the previous header or add a second header.

The default value is true (replace) and false (multiple headers of the same type are allowed ).

Http_response_code (optional) sets the http response code to the specified value (php 4 and later versions are available)

Jump:

Header ('Location: http://www.phpfensi.com/'); send http status

Header ("status: 404 not found ");

Set cache:

Header ("cache-control: no-cache, must-revalidate"); // http/1.1

Header ("expires: sat, 26 jul 1997 05:00:00 gmt ");

Use the header for file download:

1. Header ("content-type: application/pdf"); // The file will be called downloaded.pdf
2. Header ("content-disposition: attachment?filename='downloaded='"); // The pdf source is in original #
3. Readfile ("original.pdf ");