public function percent($num_amount, $num_total, $format = true)
{
if ($num_amount == 0 or $num_total == 0) {
return 0;
}
$count1 = $num_amount / $num_total;
$count2 = $count1 * 100;
if (!$format) {
return $count2;
}
$count = number_format($count2, 0);
return $count;
}