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## static or vitural file caching
##
function header_filecache($days=1, $file='')
{
global $_SERVER; // for PHP/4.0.x
if($file && !@file_exists($file)) return FALSE;
$term = (int)$days; // alway $days > 0
$req = $_SERVER['HTTP_IF_MODIFIED_SINCE']; // request modified datetime
$time = array();
$time['expire'] = $term * 86400; // expire term, after cached
$time['client'] = $term * 300; // client 'think time', or keepalive
if($file)
{
$time['cur'] = $time['chk'] = @filemtime($file);
} else
{
$time['cur'] = time(); // virual file mtime
$time['chk'] = $time['cur'] - $time['expire'];
}
if($req && strtotime($req)>=$time['chk'])
{
header('HTTP/1.1 304 Not Modified');
exit; // don't print any messages
}
header('Expires: '.gmdate('D, d M Y H:i:s T',$time['cur']+$time['expire']));
header('Last-Modified: '.gmdate('D, d M Y H:i:s T',$time['cur'])); // GMT
header('Cache-control: private, max-age='.$time['client'].',
pre-check='.$time['client']);
return TRUE; // alway true
}
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readfile($img); ¾Õ¿¡
header_filecache(4,$img);
readfile($img); ¾Õ¿¡
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