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- $LastModified_unix = $date_changed; // время последнего изменения страницы
- $LastModified = gmdate("D, d M Y H:i:s GMT", $LastModified_unix);
- $IfModifiedSince = '';
- if (isset($_ENV['HTTP_IF_MODIFIED_SINCE'])){
- $IfModifiedSince = strtotime(substr($_ENV['HTTP_IF_MODIFIED_SINCE'], 5));
- }
- if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])){
- $IfModifiedSince = strtotime(substr($_SERVER['HTTP_IF_MODIFIED_SINCE'], 5));
- }
- if ($IfModifiedSince && $IfModifiedSince >= $LastModified_unix) {
- header($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified');
- exit;
- }
- header('Last-Modified: ' . $LastModified);
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