ShadowSwap影子交易所系统开发技术（测试版）

用一段计算机指令实现自我验证、自动执行，不同的DAPP会采用不同的底层区块开发平台和共识机制，或者自行发布d币，并产生可以验证的证据来证明合约操作的有效性。DAPP，分布式应用/去中心化应用。

   }    // 处理用户的交易操作    function trade($user,$fromToken, $toToken,$amount) {

           if ($this->balances[$user][$fromToken] >=$amount) {

                       $this->balances[$user][$fromToken] -=$amount;

                                   $this->balances[$user][$toToken] +=$amount;

               echo "$user traded$amount $fromToken for$amount $toToken.\n";                                                        } else {

                   echo "$user does not have enough$fromToken.\n";        }    }

 }

// 测试代码$exchange = new BOWExchange();
// 输出交易对列表$tokens = $exchange->getTokens();
echo "Available tokens:\n";foreach ($tokens as $token) {

   echo "$token[0]/$token[1]\n"; } }

    // 输出用户余额$user1 = 'user1';
$user2 = 'user2';echo "\n$user1 balance:
\n";print_r($exchange->getBalance($user1));
echo "\n$user2 balance:\n";print_r($exchange->getBalance($user2));

// 用户充值$exchange->
deposit($user1, 'BOW', 10);
$exchange->deposit($user2, 'ETH', 5);

// 用户提现开I762蕟O72搭9II9.$exchange->
withdraw($user1, 'BOW', 5);

// 用户交易$exchange->
trade($user1, 'BOW', 'ETH', 5);$exchange->trade($user2, 'ETH', 'BOW', 5);

以下是一个简单的 PHP 代码示例，实现了一个简单的交易所，命名为 BOW 弓箭交易所。

phpCopy code<?php// BOW 弓箭交易所class BOWExchange {

    private $tokens = array(); // 存储交易对
    private $balances = array(); // 存储用户余额

    function __construct() {
            // 初始化交易对和用户余额
        $this->tokens['BOW/ETH'] = array('BOW', 'ETH');
                $this->balances['user1'] = array('BOW' => 100, 'ETH' => 5);
                        $this->balances['user2'] = array('BOW' => 50, 'ETH' => 10);
                        
    }
    
        // 返回当前交易对列表
    function getTokens() {
            return $this->tokens;
    }
    
        // 返回指定用户的余额
    function getBalance($user) {
            return $this->balances[$user];
    }
        // 处理用户的充值操作
    function deposit($user, $token, $amount) {
            $this->balances[$user][$token] += $amount;
                    echo "$user deposited $amount $token.\n";
    }
    
        // 处理用户的提现操作
    function withdraw($user, $token, $amount) {
            if ($this->balances[$user][$token] >= $amount) {
                $this->balances[$user][$token] -= $amount;
                            echo "$user withdrew $amount $token.\n";
        } else {
                    echo "$user does not have enough $token.\n";
        }

// 输出用户余额echo
 "\n$user1 balance:\n";print_r($exchange->getBalance($user1));
 echo "\n$user2 balance:\n";
 print_r($exchange->getBalance($user2));