本文实例讲述了PHP用于计算执行时间的类 ，感兴趣的小伙伴，下面一起跟随编程之家 jb51.cc的小编来看看吧。
经测试代码如下：
/**
* 计算函数或者一段代码的执行时间
*
* @param
* @arrange (512.笔记) 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();
*/
