Die von PHP entwickelte Second-Hand-Recycling-Website unterstützt mehrere Transaktionsmethoden

project/
├── app/
│   ├── controllers/
│   │   ├── PostController.php
│   │   ├── UserController.php
│   │   └── ...
│   ├── models/
│   │   ├── PostModel.php
│   │   ├── UserModel.php
│   │   └── ...
│   └── views/
│       ├── post/
│       │   ├── index.php
│       │   ├── create.php
│       │   ├── edit.php
│       │   └── ...
│       ├── user/
│       │   ├── index.php
│       │   ├── login.php
│       │   ├── register.php
│       │   └── ...
│       └── ...
├── public/
│   ├── css/
│   ├── js/
│   └── img/
└── index.php

CREATE TABLE users (
    id INT PRIMARY KEY AUTO_INCREMENT,
    username VARCHAR(255) UNIQUE NOT NULL,
    password VARCHAR(255) NOT NULL,
    email VARCHAR(255) UNIQUE NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE posts (
    id INT PRIMARY KEY AUTO_INCREMENT,
    user_id INT,
    title VARCHAR(255) NOT NULL,
    description TEXT,
    price DECIMAL(10, 2) NOT NULL,
    status ENUM('active', 'sold') DEFAULT 'active',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY(user_id) REFERENCES users(id)
);

class PostModel extends Model
{
    // ...
    const PAYMENT_METHOD_CASH = 'cash';
    const PAYMENT_METHOD_BANK_TRANSFER = 'bank_transfer';
    const PAYMENT_METHOD_PAYPAL = 'paypal';
    const PAYMENT_METHOD_ALIPAY = 'alipay';
    // ...
}

<select name="payment_method">
    <option value="<?php echo PostModel::PAYMENT_METHOD_CASH; ?>">现金</option>
    <option value="<?php echo PostModel::PAYMENT_METHOD_BANK_TRANSFER; ?>">银行转账</option>
    <option value="<?php echo PostModel::PAYMENT_METHOD_PAYPAL; ?>">PayPal</option>
    <option value="<?php echo PostModel::PAYMENT_METHOD_ALIPAY; ?>">支付宝</option>
</select>

class PostController extends Controller
{
    // ...
    public function create()
    {
        // ...
        
        $paymentMethod = $_POST['payment_method'];
        
        if ($paymentMethod == PostModel::PAYMENT_METHOD_PAYPAL) {
            // 调用PayPal API进行付款处理
            // ...
        }
        
        // ...
    }
}