<?
/**
 * 一个用于计算函数执行时间的PHP类c_Timer代码
 *
 * @param 
 * @author 网： jb51.cc
 **/
class  c_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{ 
			$start_u  =  substr($this->t_start,10);   
			$start_s  =  substr($this->t_start,11,10); 
			$stop_u    =  substr($this->t_stop,10);     
			$stop_s    =  substr($this->t_stop,10); 
			$start_total  =  doubleval($start_u)  +  $start_s; 
			$stop_total    =  doubleval($stop_u)  +  $stop_s;
			$this->t_elapsed  =  $stop_total  -  $start_total;
			return  $this->t_elapsed; 
		} 
	} 
};
/*  Here's  an  example  usage:
		$timer  =  new  c_Timer;
		$timer->start(); 
		echo  "<hr>"; 
		$timer->stop();
		echo  $timer->elapsed();
*/ 
/***   来自编程之家 jb51.cc（jb51.cc）   ***/