PHP division by zero error - php

Question

I did some research about division by zero error in PHP. I found a couple of most of them said to do an if statement like I did with my code below, but I am still getting an error, can someone tell me what's wrong with my code?
<?php
$result = array(
'price' => 0,
'special' => 80
);
$product = array(
'savings' => round((($result['price'] - $result['special'])/$result['price'])*100, 0)
);
if ($result['price'] == 0) {
echo $result['price'];
} else {
echo "You will save " . $product['savings'] ."%";
}
?>
I tried both
If == 0 and if != 0
as I am fairly new to PHP, won't my if statement mean if the price of product = 0 than echo out the price and if it's not than echo out the special price?
I'm not allowed to move the $product array.

Answer 1

This seems to make more sense, money-wise: check first if the price is higher than the special, and if so, perform the calculation.
$product = array(
'savings' => ($result['price'] > $result['special'] ? (round((($result['price'] - $result['special'])/$result['price'])*100, 0)) : 0)
);

Answer 2

You have to move the division inside your if/else statement.
$result = array(
'price' => 100,
'special' => 80
);
if ($result['price'] == 0) {
echo $result['price'];
} else {
$product = array('savings' => round((($result['price'] - result['special'])/$result['price'])*100, 0)
);
echo "You will save " . $product['savings'] ."%";
}