What is the efficient way to escape from "Division by zero error"-CodePudding

I have written a rating system function for products and it used to throw a "Division by zero error" so in order to escape that error I have decided to implement it this way, I would like to know if it is a good way to escape from that error

$ratingNumber = 10; 
$count = 0;

$average= $ratingNumber / isset($count)

CodePudding user response：

It wont work as you intended.

isset() checks if a variable, well, is set. You set 0 to $count then isset will always return true in this case.

You could do this instead:

function division($a, $b) {
   if($b === 0) {
      throw new InvalidArgumentException('Argument $b should not be 0.');
   }

   return $a/$b;
}

CodePudding user response：

You should avoid the division if $count = 0. You can try it in the following way.

$ratingNumber = 10; 
$count = 0;

if($count > 0){
  $average= $ratingNumber / $count;
}