timer_start($name)
drupal/includes/bootstrap.inc, line 239
Start the timer with the specified name. If you start and stop the same timer multiple times, the measured intervals will be accumulated.
name The name of the timer.
function timer_start($name) {
global $timers;
$timers[$name]['start'] = microtime(TRUE);
$timers[$name]['count'] = isset($timers[$name]['count']) ? ++$timers[$name]['count'] : 1;
}