PHP Code run Time view class code share

The code is as follows:
date:2011-08-05
Class runtime//page Execution time classes
{
private $starttime;//page Start execution time
private $stoptime;//page End Execution time
private $spendtime;//page execution takes time
function Getmicrotime ()//Gets the floating-point number that returns the current microsecond
{
List ($usec, $sec) =explode ("", Microtime ());
return (float) $usec + (float) $sec);
}
function start ()//page to start the execution of functions, return to start Page execution time
{
$this->starttime= $this->getmicrotime ();
}
function end ()//Displays the time the page was executed
{
$this->stoptime= $this->getmicrotime ();
$this->spendtime= $this->stoptime-$this->starttime;
Return round ($this->spendtime,10);
}
function display ()
{
$this->end ();
echo "<p> Run Time:". Round ($this->spendtime,10). " Seconds </p> ";
}
}
/* Call method
$timer =new Runtime ();
$timer->start ();

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