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