Retrieve current time in milliseconds - PHP Function

function currentTimeMillis() {
    list($usec, $sec) = explode(" ", microtime());
    return round(((float)$usec + (float)$sec) * 1000);
}

$times = gettimeofday();
$seconds = strval($times["sec"]);
$milliseconds = strval(floor($times["usec"]/1000));
$missingleadingzeros = 3-strlen($milliseconds);
if($missingleadingzeros >0){
for($i = 0; $i < $missingleadingzeros; $i++){
$milliseconds = '0'.$milliseconds;
}
}
return intval($seconds.$milliseconds);

thanks to make my code more shorter :)