How to set HTTP header with php header function

php header function sets the HTTP header method: [header( 'Content-Type: text/html; charset=utf-8 '); ], which means setting the encoding to utf-8.

The example of PHP header function setting HTTP header is as follows:

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Define encoding

header( 'Content-Type:text/html;charset=utf-8 ');

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 delayed redirection:

header('Refresh: 10; url=http://www.example.org/');
print 'You will be redirected in 10 seconds';

Tell the browser the last modification time

$time = time() - 60; // or filemtime($fn), etc
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $time).' GMT');

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'); // Date in the past
header('Pragma: no-cache');

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