Modify HTTP Headers in PHP with Examples

Here is a collection of examples that show how to use the header() function of PHP to set HTTP headers.
 
PHP Examples - Modify HTTP Header

// Use this header instruction to fix 404 headers produced by url rewriting.
header('HTTP/1.1 200 OK');

// Page was not found:
header('HTTP/1.1 404 Not Found');

// Access forbidden:
header('HTTP/1.1 403 Forbidden');

// The page moved permanently should be used for
// all redirections, because search engines know
// what's going on and can easily update their urls.
header('HTTP/1.1 301 Moved Permanently');

// Server error
header('HTTP/1.1 500 Internal Server Error');

// Redirect to a new location:
header('Location: http://www.example.org/');

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

// you can also use the HTML syntax:
//
header('Content-Transfer-Encoding: binary');
// load the file to send:
readfile('example.zip');

// Disable caching of 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');

// set content type:
header('Content-Type: text/html; charset=iso-8859-1');
header('Content-Type: text/html; charset=utf-8');
header('Content-Type: text/plain'); // plain text file
header('Content-Type: image/jpeg'); // JPG picture
header('Content-Type: application/zip'); // ZIP file
header('Content-Type: application/pdf'); // PDF file
header('Content-Type: audio/mpeg'); // Audio MPEG (MP3,...) file
header('Content-Type: application/x-shockwave-flash'); // Flash animation

// show sign in box
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Basic realm="Top Secret"');
print 'Text that will be displayed if the user hits cancel or ';
print 'enters wrong login data';

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