PHP Headers for your Web Application

Hi friends, In this post i would like to share my knoweldge about redirection , 404 ( Page not found error message) ,service not avialable(503), CSS , Javascript , For the images and application type ( PDF ,…).
For above requirements we can use php headers to solve the issues.

1) 301 moved permanently (redirect):

<?php
header('HTTP/1.1 301 Moved Permanently');
header('Location: http://www.domain.com');
die();
?>

2) 302 moved temporarily(redirect):

<?php
header('Location: http://www.domain.com');
die();
?>

3) 404 Page Not Found:

<?php
header('HTTP/1.1 404 Not Found');
?>

4) Service not avaliable:

<?php
header('HTTP/1.1 503 Service Temporarily Unavailable');
header('Status: 503 Service Temporarily Unavailable');
header('Retry-After: 60');
?>

5) CSS:

<?php
header('Content-Type: text/css');
?>

6) Javascript header:

<?php
header('Content-Type: application/javascript');
?>

7) Images:

7.1) For JPEG(jpg):

<?php
header('Content-Type: image/jpeg');
?>

7.2) For PNG:

<?php
header('Content-Type: image/png');
?>

7.3)For BMP:

<?php
header('Content-Type: image/bmp');
?>

8 ) PDF (output pdf with php):

<?php
header('Content-Type: application/pdf');
echo file_get_contents('filename.pdf');
?>

9) Cache (force browsers not to cache files):

<?php
header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Cache-Control: pre-check=0, post-check=0, max-age=0');
header ('Pragma: no-cache');
?>

10) Download dialog:

<?php
header('Content-Disposition: attachment; filename=' . urlencode($f));
header('Content-Type: application/force-download');
header('Content-Type: application/octet-stream');
header('Content-Type: application/download');
header('Content-Description: File Transfer');
header('Content-Length: ' . filesize($f));
echo file_get_contents($f);
?>

11) Authentication (force the browser to pop up a Username/Password input window) – only available when PHP is running as an Apache module:

<?php
if (!isset($_SERVER['PHP_AUTH_USER'])) {
header('WWW-Authenticate: Basic realm="The Realm"');
header('HTTP/1.0 401 Unauthorized');
echo 'If cancel is pressed this text shows';
die();
} else {
//always escape your data//
$user='user_name';
$pass='password';
if($_SERVER['PHP_AUTH_USER']==$user && $_SERVER['PHP_AUTH_PW']==$pass){
echo 'Authorized';
}
}
?>

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