php 枚举用法

<?php

enum FormStatus: string {
    case Draft = 'draft';
    case Published = 'published';
    case Archived = 'archived';
}

enum OrderStatus: int {
    case Pending = 0;
    case Shipped = 1;
    case Delivered = 2;
}

function processForm(FormStatus $status) {
    switch ($status) {
        case FormStatus::Draft:
            echo "Form is in draft mode.";
            break;
        case FormStatus::Published:
            echo "Form is published.";
            break;
        case FormStatus::Archived:
            echo "Form is archived.";
            break;
    }
}

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

processForm(FormStatus::Draft);
processOrder(OrderStatus::Shipped);
?>