class DiscountApplier
{
    private DiscountCalculator $calculator;

    public function __construct(DiscountCalculator $calculator)
    {
        $this->calculator = $calculator;
    }

    public function apply(Basket $basket): void
    {
        if ($basket->hasItems()) {
            $discount = 0.0;

            foreach ($basket->getItems() as $basketItem) {
                if ($basketItem->isTaxable()) {
                    if ($basketItem->getPrice() > 0) {
                        $discount += $this->calculator->getDiscount($basketItem);
                    }
                }
            }

            $basket->applyDiscount($discount);
        }
    }
}

class DiscountApplier
{
    private DiscountCalculator $calculator;

    public function __construct(DiscountCalculator $calculator)
    {
        $this->calculator = $calculator;
    }

    public function apply(Basket $basket): void
    {
        if (!$basket->hasItems()) {
            return;
        }

        $discount = 0.0;

        foreach ($this->getDiscountableItems($basket) as $basketItem) {
            $discount += $this->calculator->getDiscount($basketItem);
        }

        $basket->applyDiscount($discount);
    }

    /**
     * @return iterable<BasketItem>
     */
    private function getDiscountableItems(Basket $basket): iterable
    {   
        foreach ($basket->getItems() as $basketItem) {
            if (!$basketItem->isTaxable() || $basketItem->getPrice() === 0) {
                continue;
            }

            yield $basketItem;
        }
    }
}

function mapOrderStatusToLabel(Order $order): string
{
    if ($order->isComplete()) {
        return 'Completed';
    } elseif ($order->isPending()) {
        return 'In transport';
    } else {
        return 'New';
    }
}

function mapOrderStatusToLabel(Order $order): string
{
    if ($order->isComplete()) {
        return 'Completed';
    }

    if ($order->isPending()) {
        return 'In transport';
    }

    return 'New';
}

function act(bool $success)
{
    if ($success) {
        // towering block of code
        // towering block of code
        // towering block of code
        // towering block of code
        // towering block of code
        // towering block of code
        // towering block of code
    } else {
        // one liner
    }
}

function act(bool $success)
{
    if (!$success) {
        // one liner
        return;
    }

    // towering block of code
    // towering block of code
    // towering block of code
    // towering block of code
    // towering block of code
    // towering block of code
    // towering block of code
}

function mapOrderStatusToLabel(Order $order): string
{
    $label = 'unknown';

    if ('complete' === $order->getStatus()) {
        $label = 'Completed';
    }

    if ('pending' === $order->getStatus()) {
        $label = 'In transport';
    }

    if ('new' === $order->getStatus()) {
        $label = 'New';
    }

    return $label';
}

function mapOrderStatusToLabel(Order $order): string
{
    switch ($order->getStatus()) {
        case 'complete':
            return 'Completed';

        case 'pending':
        case 'in_transport':
            return 'In transport';

        case 'new':
            return 'New';

        default:
            return 'unknown';
    }
}

function getTotalWithTax(Payment $payment, int $taxPercent): float
{
    // is the order correct at all?

    return (float) (int) $payment->getTotal() * (1 + $taxPercent / 100);
}

function getTotalWithTax(Payment $payment, int $taxPercent): float
{
    // descriptive variables with intermediary values for easier debugging
    $paymentAmount = (int) $payment->getAmount();
    $taxCoefficient = 1 + ($taxPercent / 100);

    $totalWithTax = $paymentAmount * $taxCoefficient;

    return (float) $totalWithTax;
}

if ($httpApi->hasAccess($user) && $user->isActive() && $isSuccess) {
    // all conditions must be met in order for this condition to execute
    // in case of 'and' we should keep the heaviest conditions last
    // and the fastest to execute in front
}

if ($isSuccess && $user->isActive() && $httpApi->hasAccess($user)) {
    // if $isSuccess is false
    // other conditions will not be evaluated
}

class UserRepository
{
    public function getUsers(?bool $includingDeleted = false): array
    {
    }
}

class UserRepository
{
    public function getUsers(): array
    {
    }

    public function getUsersIncludingDeleted(): array
    {
    }
}

$workers = [
  ['id' => 1, 'name' => 'John Doe'],
  ['id' => 3, 'name' => 'Jane Doe'],
  ['id' => 4, 'name' => 'Monica Trullo'],
  ['id' => 5, 'name' => 'Jonathan Bank'],
];

foreach ($workers as $worker) {
  $workerId = $worker['id'];
  $workerName = $worker['name'];

  // …
}

$workers = [
  ['id' => 1, 'name' => 'John Doe'],
  ['id' => 3, 'name' => 'Jane Doe'],
  ['id' => 4, 'name' => 'Monica Trullo'],
  ['id' => 5, 'name' => 'Jonathan Bank'],
];

foreach ($workers as ['id' => $workerId, 'name' => $workerName]) {
  // …
}

$userAvatars = [];
foreach ($users as $user) {
    $userAvatars[$user['id']] = $user['avatar'];
}

$userAvatars = array_column($users, 'avatar', 'id');

$result = array();
foreach ($sources as $source) {
    $result = array_merge($result, $source);
}

$result = array_merge(...$sources);

$moneyInTheBank = [
    'John' => 10,
    'Alex' => 0,
    'Jenna' => 69,
    'Olivia' => null
];

if (!isset($moneyInTheBank['Olivia'])) {
    $moneyInTheBank['Olivia'] = 20;
}

echo $moneyInTheBank['Olivia'];

// outputs 20

$moneyInTheBank = [
    'John' => 10,
    'Alex' => 0,
    'Jenna' => 69,
    'Olivia' => null
];

if (!array_key_exists('Olivia', $moneyInTheBank)) {
    $moneyInTheBank['Olivia'] = 20;
}

echo $moneyInTheBank['Olivia'];

// outputs NULL