A Timer that checks how long a script / function / query took to run

<?php
/*
Timer Class by Shahir Ali (da^hype)
URL: http://www.codedb.org

Usage:
$timer = new Timer;
$timer->start_time();

sleep(5); //sleep for a while

$timer->end_time();
echo "Script ran in: ";
echo $timer->elapsed_time();
echo " seconds."; 
*/

//Timer class
class Timer
{

 var $stime; //value of start time
 var $etime; //value of end time

 //default constructor
 function Timer()
 {
       $this->stime = 0.0;
 }

 function get_microtime()
 {
      $tmp = explode(" ",microtime());
      $rtime = (double)$tmp[0] + (double)$tmp[1];
      return $rtime;
 }

 function start_time()
 {
     $this->stime = $this->get_microtime();
 }

 function end_time()
 {
     $this->etime = $this->get_microtime();
 }

 function elapsed_time($decimal = 3)
 {
     return round(($this->etime - $this->stime),$decimal);
 } 

}
?>