php枚举

<?php
enum Status: string {
    case Pending = 'pending';
    case Shipped = 'shipped';
    case Delivered = 'delivered';
}

enum Role: string {
    case Admin = 'admin';
    case User = 'user';
    case Guest = 'guest';
}

function processOrder(Status $status) {
    switch ($status) {
        case Status::Pending:
            echo "Order is pending.\n";
            break;
        case Status::Shipped:
            echo "Order is shipped.\n";
            break;
        case Status::Delivered:
            echo "Order is delivered.\n";
            break;
    }
}

processOrder(Status::Pending);
processOrder(Status::Shained); // 这里会报错，因为 Shained 不是有效的枚举值
?>

<?php
function processOrder(Status $status) {
    if (!in_array($status, Status::cases(), true)) {
        throw new InvalidArgumentException("Invalid status: $status");
    }
    switch ($status) {
        case Status::Pending:
            echo "Order is pending.\n";
            break;
        case Status::Shipped:
            echo "Order is shipped.\n";
            break;
        case Status::Delivered:
            echo "Order is delivered.\n";
            break;
    }
}

try {
    processOrder(Status::Pending);
    processOrder(Status::Shained); // 这里会抛出异常
} catch (InvalidArgumentException $e) {
    echo $e->getMessage();
}
?>