記錄頁面執行時間php代碼

<?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();
//你的代碼開始
$a = 0;
for($i=0; $i<1000000; $i++)
{
    $a += $i;
}
//你的代碼結束
$runtime->stop();
echo "頁面執行時間: ".$runtime->spent()." 毫秒";
?></pre>