警告：在629行的C：\ xampp \ htdocs \ engine \ core.php中除以零

I'm new to PHP and I have an error on my website and can't figure out the right way to fix it.

The error:

Warning: Division by zero

The code I'm using:

public function percent($num_amount, $num_total)
{
    $count1 = $num_amount / $num_total;
    $count2 = $count1 * 100;
    $count = round($count2);

    return $count;
}

I know it has something to do with dividing by 0 which obviously can't. But how do I change that and fix this error?

Simply....

public function percent($num_amount, $num_total)
{
    if($num_total > 0){
       $count1 = $num_amount / $num_total;
       $count2 = $count1 * 100;
       $count = round($count2);
       return $count;
    }else{
       return 0; // or whatever you want
    }  
}

If $num_total is zero, then check if $num_amount is also zero. If it is, then return a value that's appropriate (possibly 100%). If $num_amount is not also zero then you have some logic error which you should flag.