PHP header function usage example (1)

print ""; //Usually the cache file is read
?>
print" "; //Added a unique number to make the browser re-request
w//print" ";
?>

2, customize the php function, and copy the image Sent to browser for display.

function PE_img_by_path($PE_imgpath = “”)
{
 if (file_exists($PE_imgpath)) {
 $PE_imgarray = pathinfo($PE_imgpath);
 $iconcontent = file_get_contents($PE_img path );
 header("Content-type: image/" . $PE_imgarray["extension"]);
 header('Content-length: ' . strlen($iconcontent));
 echo $iconcontent;
 die(0) ;
 }
 return false;
}
?>

More examples:

// ok
header('HTTP/1.1 200 OK');
//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://bbs.it-home.org/');
 //File delayed redirection:
header('Refresh: 10; url=http://bbs.it-home.org/');
print 'You will be redirected in 10 seconds';
//Of course, it can also Implemented using html syntax
//
// override X-Powered-By: PHP:
 header('X-Powered-By: PHP/4.4.0′);
header('X-Powered-By: Brain/0.6b');
//Document language
header('Content-language: en') ;
//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');
//Tell the browser that the document content has not changed
header('HTTP/1.1 304 Not Modified');
//Set the content length
header('Content-Length : 1234′);
//Set as a download type
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="example.zip"');
 header('Content-Transfer-Encoding: binary');
// load the file to send:
readfile('example.zip');
// disable caching for the current document
header('Cache-Control: no- cache, no-store, max-age=0, must-ridate');
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 format
header('Content-Type: image/jpeg'); //JPG image
header('Content-Type: application/zip'); // ZIP file
header('Content-Type: application/pdf'); // PDF file
header('Content-Type: audio/mpeg'); // Audio file
header(' Content-Type: application/x-shockwave-flash'); //Flash animation
//Display login dialog 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';
?>