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Prior code buggy, ineffective. #70

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Prior code buggy, ineffective. #70

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41 changes: 6 additions & 35 deletions php/evercookie_etag.php
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Original file line number Diff line number Diff line change
Expand Up @@ -10,43 +10,14 @@
*/

// we don't have a cookie, so we're not setting it
if (!isset($_COOKIE['evercookie_etag']) || empty($_COOKIE['evercookie_etag'])) {
// read our etag and pass back
if (!function_exists('apache_request_headers')) {

function apache_request_headers()
{
// Source: http://www.php.net/manual/en/function.apache-request-headers.php#70810
$arh = array();
$rx_http = '/\AHTTP_/';
foreach ($_SERVER as $key => $val) {
if (preg_match($rx_http, $key)) {
$arh_key = preg_replace($rx_http, '', $key);
$rx_matches = array();
// do some nasty string manipulations to restore the original letter case
// this should work in most cases
$rx_matches = explode('_', $arh_key);
if (count($rx_matches) > 0 and strlen($arh_key) > 2) {
foreach ($rx_matches as $ak_key => $ak_val) {
$rx_matches[$ak_key] = ucfirst($ak_val);
}
$arh_key = implode('-', $rx_matches);
}
$arh[$arh_key] = $val;
}
}

return ($arh);
}
}

$headers = apache_request_headers();
echo $headers['If-None-Match'];

header('Etag: $headers["If-None-Match"]')
exit;
if (empty($_COOKIE['evercookie_etag'])) {
header("HTTP/1.1 304 Not Modified");
header("If-None-Match: *");
exit;
}

// set our etag
header("HTTP/1.1 200 OK");
header('Etag: ' . $_COOKIE['evercookie_etag']);
echo $_COOKIE['evercookie_etag'];
exit;