本文实例讲述了php实现用于计算执行时间的类。分享给大家供大家参考。具体如下：

有了这个php类，计算函数或者一段代码的执行时间就简单了

<?php 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,0,10); $start_s = substr($this->t_start,11,10); $stop_u = substr($this->t_stop,0,10); $stop_s = substr($this->t_stop,11,10); $start_total = doubleval($start_u) + $start_s; $stop_total = doubleval($stop_u) + $stop_s; $this->t_elapsed = $stop_total - $start_total; return $this->t_elapsed; } } }; ?>

用法示例如下：

<?php $timer = new c_Timer; $timer->start(); echo "<hr>"; $timer->stop(); echo $timer->elapsed(); ?>

希望本文所述对大家的php程序设计有所帮助。