PHP开发实时聊天功能的用户充值和虚拟货币管理

<?php
    // 获取用户的充值金额
    $amount = $_POST['amount'];

    // 将充值金额添加到用户的账户余额中
    $user_id = $_SESSION['user_id'];
    $balance = getUserBalance($user_id);
    $new_balance = $balance + $amount;
    updateUserBalance($user_id, $new_balance);

    // 生成充值记录并保存到数据库中
    $recharge_time = date("Y-m-d H:i:s");
    saveRechargeRecord($user_id, $amount, $recharge_time);

    // 返回充值成功的消息
    echo "充值成功！";
?>

<?php
    // 获取购买礼物所需的虚拟货币数量和收礼物的用户ID
    $gift_id = $_POST['gift_id'];
    $receiver_id = $_POST['receiver_id'];

    // 检查用户是否拥有足够的虚拟货币
    $buyer_id = $_SESSION['user_id'];
    $balance = getUserBalance($buyer_id);
    $gift_price = getGiftPrice($gift_id);
    if ($balance < $gift_price) {
        echo "您的虚拟货币不足，无法购买！";
        return;
    }

    // 扣除虚拟货币
    $new_balance = $balance - $gift_price;
    updateUserBalance($buyer_id, $new_balance);

    // 将购买记录保存到数据库中
    $purchase_time = date("Y-m-d H:i:s");
    savePurchaseRecord($buyer_id, $receiver_id, $gift_id, $gift_price, $purchase_time);

    // 发送礼物给收礼物的用户
    sendGift($buyer_id, $receiver_id, $gift_id);

    // 返回购买成功的消息
    echo "购买成功！";
?>