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How do you design a vending machine in PHP

PHP

class VendingMachine {
    private $money;
    private $products;

public function __construct($money, $products) {
        $this->money = $money;
        $this->products = $products;
    }

public function getMoney() {
        return $this->money;
    }

public function getProducts() {
        return $this->products;
    }

public function addMoney($amount) {
        if ($amount > 0) {
            $this->money += $amount;  // add money to the machine's balance

return true;  // success!  money was added to the machine's balance.  
        } else {  // invalid amount of money was added.

return false;  // failure!   invalid amount of money was added.  
        }        
    }

public function buyProduct($productName, &$change) {

if (array_key_exists($productName, $this->products)) {  // check if product exists in the machine.

if ($this->getMoney() >= $this->getProducts()[$productName]) {  // check if there is enough money in the machine to buy the product.

// calculate change:   subtract product price from current balance and store it in change variable.  
                // then set current balance to zero (because we are giving all of it as change).

$change = round(($this->getMoney() - ($this->getProducts()[$productName])) * 100) / 100;     // round to 2 decimal places.

echo "You bought " . ucfirst($productName) . " for " . number_format($this->getProducts()[$productName], 2, '.', '') . ".\n";

echo "Your change is: " . number_format($change, 2, '.', '') . ".\n";

echo "\n";     // new line for readability.

return true;  // success! product was bought and change was given back to user.

} else {  // not enough money in the machine to buy this product.   tell user how much more they need to add before they can buy this product.

echo "You need to add at least: " . number_format(round(($this->getProducts()[$productName] - ($this->getMoney())), 2), 2, '.', '') . ".\n";     // round to 2 decimal places and display only two decimal places after rounding up or down (if necessary).

echo "\n";     // new line for readability.

return false;  // failure! not enough money in the machine to buy this product so no purchase was made and no change was given back to user.     
            }            
        } else {  // invalid product name entered by user so no purchase was made and no change was given back to user.

echo ucfirst($productName) . " does not exist in this vending machine." . "\n";     // tell user that this product does not exist in this vending machine so they can try again with a different product name or exit program by entering 'exit'.

echo "\n";     // new line for readability.

return false;  // failure! invalid product name entered by user so no purchase was made and no change was given back to user.         
        }        
    }        
}

🤖 Code Explanation

?>

This is a vending machine class written in PHP. The class has private money and products properties and public methods for adding money, buying products, and getting the machine's balance and product list.

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How do you design a vending machine in PHP

PHP

🤖 Code Explanation

More problems solved in PHP