php页面执行计算时间代码

$pagestartime=microtime();

sleep(5);

$pageendtime = microtime();

$starttime = explode(" ",$pagestartime);

$endtime = explode(" ",$pageendtime);

$totaltime = $endtime[0]-$starttime[0]+$endtime[1]-$starttime[1];

$timecost = sprintf("%s",$totaltime);

echo "页面运行时间: $timecost 秒";