PHP 计算页面执行时间

<?php
class runtime
{
   var $StartTime = 0;
   var $StopTime = 0;

   function get_microtime()
   {
   list($usec, $sec) = explode(‘ ‘, microtime());
   return ((float)$usec + (float)$sec);
   }

   function start()
   {
   $this->StartTime = $this->get_microtime();
   }

   function stop()
   {
   $this->StopTime = $this->get_microtime();
   }

   function spent()
   {
   return round(($this->StopTime – $this->StartTime) * 1000, 1);
   }

}


//例子 
$runtime= new runtime;
$runtime->start();

//你的代码开始

$a = 0;
for($i=0; $i<1000000; $i++)
{
   $a += $i;
}

//你的代码结束

$runtime->stop();
echo “页面执行时间: “.$runtime->spent().“ 毫秒“;

?>