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function getmicrotime(){

 list($usec, $sec) = explode(" ",microtime());
 return ((float)$usec + (float)$sec);

}

$time_start = getmicrotime();

# DEIN CODE.

$time_end = getmicrotime();
$time     = $time_end - $time_start;
$time     = number_format($time,3,',','.');
echo $time;