php測試代碼執行時間的類

<?phpclass timer { var $StartTime = 0; var $StopTime = 0; var $TimeSpent = 0; function start(){ $this->StartTime = microtime(); } function stop(){ $this->StopTime = microtime(); } function spent() { if ($this->TimeSpent) { return $this->TimeSpent; } else { $StartMicro = substr($this->StartTime,0,10); $StartSecond = substr($this->StartTime,11,10); $StopMicro = substr($this->StopTime,0,10); $StopSecond = substr($this->StopTime,11,10); $start = floatval($StartMicro) + $StartSecond; $stop = floatval($StopMicro) + $StopSecond; $this->TimeSpent = $stop - $start; return round($this->TimeSpent,8).'秒'; }} // end function spent(); } //end class timer;$timer = new timer; $timer->start();//測試代碼

$timer->stop();echo '</br>已耗用時間為: '.$timer->spent();unset($timer);?>