获得页面执行时间

获得页面执行时间
header("Content-type:text/html;charset=utf-8");
class runtime
{
private $begintime = 0;
private $endtime = 0;
private function gettime()
{
list($usec,$sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
public function begin()
{
$this->begintime = $this->gettime();
}
public function end()
{
$this->endtime = $this->gettime();
}
public function spent()
{
return round(($this->endtime - $this->begintime) * 1000, 1);
}
}
$runtime = new runtime();
$runtime->begin();
for ($i=0; $i echo $i;
}
$runtime->end();
echo '页面执行时间'.$runtime->spent().'毫秒';
?>

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