<?php
function micro_time_val($mytime)
{
    $gettime=explode(" ",$mytime);
    $msec=(double)$gettime[0];
    $sec=(double)$gettime[1];
    return ($sec + $msec);
}
$starttime=micro_time_val(time());

//do some tasks

$endtime=micro_time_val(time());

$difftime=$endtime-$starttime;

print "Your Script Response time is:$difftime";

?>