note 61903 added to function.header

When using PHP to output an image, it won't be cached by the client so if you don't want them to download the image each time they reload the page, you will need to emulate part of the HTTP protocol. Here's how: <?php // Test image. $fn = '/test/foo.png'; // Getting headers sent by the client. $headers = apache_request_headers(); // Checking if the client is validating his cache and if it is current. if (isset($headers['If-Modified-Since']) && (strtotime($headers['If-Modified-Since']) == filemtime($fn))) { // Client's cache IS current, so we just respond '304 Not Modified'. header('Last-Modified: '.gmdate('D, d M Y H:i:s', filemtime($fn)).' GMT', true, 304); } else { // Image not cached or cache outdated, we respond '200 OK' and output the image. header('Last-Modified: '.gmdate('D, d M Y H:i:s', filemtime($fn)).' GMT', true, 200); header('Content-Length: '.filesize($fn)); header('Content-Type: image/png'); print file_get_contents($fn); } ?> That way foo.png will be properly cached by the client and you'll save bandwith. :) ---- Server IP: 194.246.101.61 Probable Submitter: 83.203.25.117 ---- Manual Page -- http://www.php.net/manual/en/function.header.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+61903 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+61903&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+61903&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+61903&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+61903&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+61903&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+61903&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+61903&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+61903&report=yes Search -- http://master.php.net/manage/user-notes.php