header("content-type:text/html;charset=utf-8");
//microtime— 返回当前 Unix 时间戳和微秒数
$oldtime = microtime(true);
echo "本脚本运行的时间为:";
$v=0;
for ($i = 0; $i
$v++;
}
$newtime =microtime(true);
//获取时间差
$runtime = $newtime-$oldtime;
//将时间戳变为字符串—var_export 输出或返回一个变量的字符串表示
$runtime=var_export($runtime);
//截取字符串substr_count计算字串出现的次数
$postion = substr_count($runtime, 'E');
$runtime = substr($runtime,0,$postion-1);
//将字符串值转换为floatfloatval — 获取变量的浮点值
$runtime = floatval($runtime)/1000;
echo $runtime."秒";
?>
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