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：
PHP;">
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;
}
}
};
?>
用法示例如下：
PHP;">
start();
echo "
"; $timer->stop(); echo $timer->elapsed(); ?>
"; $timer->stop(); echo $timer->elapsed(); ?>
希望本文所述对大家的PHP程序设计有所帮助。
