HTTP Header

<?php
	/* Specify content language */
	header('Content-language: en');
	
	/* Specify content length */
	header('Content-Length: 3837');
	
	/* Specify content type and character set */
	header('Content-Type: text/html; charset=utf-8');
	
	/* Mention last modified date of the page content */
	header('Last-Modified: Fri, 21 Nov 2014 7:30:00 GMT');
	
	/* Mention expire date of the page content */
 	header('Expires: Expires: Sat, 16 Apr 2015 05:07:07 GMT');
 	
 	/* Request to cache content of the page in client browser */
 	header('Pragma: cache');
 	header('Cache-Control: max-age=172800, public');
 	header('User-Cache-Control: max-age=172800, public'); 
 	
 	/* Authenticate user by HTTP authentication */
 	header('WWW-Authenticate: Basic realm="Restricted Area...Please Authenticate"');
	
	/* Handle requests for missing file */	
	header('HTTP/1.1 404 Not Found'); 
	/*					or					*/
	header($_SERVER["SERVER_PROTOCOL"].' 404 Not Found');
	
	/* Redirect page to different location */
	header('Location: http://www.geekboots.com');
	
	/* Redirect page on 301 permanently moved */
	header('Location: http://www.geekboots.com', TRUE, 301);

	/* Redirect page on 302 found */
	header('Location: http://www.geekboots.com', TRUE, 302);

	/* Redirect page on 303 see other */
	header('Location: http://www.geekboots.com', TRUE, 303);

	/* Redirect page on 307 temporary redirect */
	header('Location: http://www.geekboots.com', TRUE, 307);
	
	/* Output a PDF */
	header('Content-Type: application/pdf');
	
	/* Called download.pdf */
	header('Content-Disposition: attachment; filename="download.pdf"');

?>


/****** Output ******/
Code will reflection on HTTP header.