<?
 
class Timer {
    var $t_start = 0;
    var $t_stop = 0;
    var $t_elapsed = 0;
 
    function start() { $this->t_start = microtime(); }
    function stop()  { $this->t_stop  = microtime(); }
 
    function elapsed() {
        if ($this->t_elapsed) {
            return $this->t_elapsed;
        } else {
        $start_mt = explode (" ", $this->t_start);
        $stop_mt = explode (" ", $this->t_stop);
        $start_total = doubleval($start_mt[0]) + $start_mt[1];
        $stop_total  = doubleval($stop_mt[0]) + $stop_mt[1];
            $this->t_elapsed = $stop_total - $start_total;
            return $this->t_elapsed;
        }
    }
};
 
/* Here's an example usage:
 
    $timer = new Timer;
 
    $timer->start();
    echo "<hr>";
    $timer->stop();
 
    echo $timer->elapsed();
 
*/
?>