public static function markTime($markerId)
{
list($usec, $sec) = explode(" ", microtime());
$time = (double) $usec + (double) $sec;
if (!isset($GLOBALS['qr_time_bench'])) {
$GLOBALS['qr_time_bench'] = array();
}
$GLOBALS['qr_time_bench'][$markerId] = $time;
if (!self::$timeBenchmarkStarted && $markerId != 'start') {
self::$timeBenchmarkStarted = true;
$GLOBALS['qr_time_bench']['start'] = $time;
}
}
