class Timer {

 var $classname = "Timer";
 var $start     = 0;
 var $stop      = 0;
 var $elapsed   = 0;

 # Constructor
 function Timer( $start = true ) {
  if ( $start )
   $this->start();
 }

 # Start counting time
 function start() {
 $this->start = $this->_gettime();
 }

 # Stop counting time
 function stop() {
 $this->stop    = $this->_gettime();
 $this->elapsed = $this->_compute();
 }

 # Get Elapsed Time
 function elapsed() {
 if ( !$elapsed )
 $this->stop();

  return $this->elapsed;
 }

 # Get Elapsed Time
 function reset() {
 $this->start   = 0;
 $this->stop    = 0;
 $this->elapsed = 0;
 }

 #### PRIVATE METHODS ####

 # Get Current Time
 function _gettime() {
 $mtime = microtime();
 $mtime = explode( " ", $mtime );
 return $mtime[1] + $mtime[0];
 }

 # Compute elapsed time
 function _compute() {
 return $this->stop - $this->start;
 }
 
}

$t=new Timer();