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Supports setting cache in header #13

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Supports setting cache in header #13

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29 changes: 29 additions & 0 deletions templates/header.inc
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,11 @@
* "hidden" => array(array("name" => "hidden-input-name", "value" => "hidden-input-value")),
* ); // Search box, if any
* $CURRENT_PAGE // The current page
* $CONFIG = array(
* "cache" => 1234567890, // optional, timestamp for Last
* "cache_control" => 3600, // optional, seconds for Cache-Control
* "http_response_code" => 404, // optional, HTTP response code
* );
*/
isset($TITLE) || $TITLE = "Hypertext Preprocessor";
isset($SUBDOMAIN) || $SUBDOMAIN = "";
Expand All @@ -29,8 +34,32 @@ isset($HEAD_RAND) || $HEAD_RAND = "";
isset($CSS) || $CSS = array();
isset($SEARCH) || $SEARCH = array();
isset($CURRENT_PAGE) || $CURRENT_PAGE = "";
isset($CONFIG) || $CONFIG = array();
$ROOT = substr($_SERVER["SERVER_NAME"], -8) == ".php.net" ? "//shared.php.net" : "/shared";
$current_time = time();

if (isset($CONFIG["cache"])) {
if (is_numeric($CONFIG["cache"])) {
$timestamp = $CONFIG["cache"];
} else {
$timestamp = $current_time;
}
$tsstring = gmdate("D, d M Y H:i:s ", $timestamp) . "GMT";

if (isset($_SERVER["HTTP_IF_MODIFIED_SINCE"]) && $_SERVER["HTTP_IF_MODIFIED_SINCE"] == $tsstring) {
header("HTTP/1.1 304 Not Modified");
exit;
}
header("Last-Modified: " . $tsstring);
}

if (isset($CONFIG["cache_control"]) && is_numeric($CONFIG["cache_control"])) {
header("Cache-Control: public, max-age=" . (int) $CONFIG["cache_control"]);
}

if (isset($CONFIG['http_response_code'])) {
http_response_code($CONFIG['http_response_code']);
}
?>
<!DOCTYPE html>
<html>
Expand Down