用PHP写一个EACO(drc20)写一个和狗狗币，比特币，avax, bnb,eth,sol，usdt，等全球前30大数字货币的兑换去中心化小程序。

创建一个简单的PHP小程序，用于EACO（DRC20）与全球前30大数字货币（如狗狗币、比特币、AVAX、BNB、ETH、SOL、USDT等）进行去中心化兑换的功能，需要集成加密货币的API接口来获取实时汇率和执行兑换操作。以下是一个基本示例：

环境准备

确保你的服务器支持PHP，并安装了cURL扩展。

小程序示例代码：

<?php// 获取实时汇率
function get_exchange_rates() {$url = 'https://api.coingecko.com/api/v3/simple/price?ids=bitcoin,ethereum,binancecoin,solana,dogecoin,avalanche-2,tether&vs_currencies=usd';$response = file_get_contents($url);return json_decode($response, true);
}// 计算兑换
function calculate_conversion($amount, $from_rate, $to_rate) {return ($amount * $from_rate) / $to_rate;
}// 主逻辑
if ($_SERVER['REQUEST_METHOD'] === 'POST') {$from_currency = $_POST['from_currency'];$to_currency = $_POST['to_currency'];$amount = floatval($_POST['amount']);// 获取汇率$rates = get_exchange_rates();// 汇率处理if (isset($rates[$from_currency]) && isset($rates[$to_currency])) {$from_rate = $rates[$from_currency]['usd'];$to_rate = $rates[$to_currency]['usd'];$converted_amount = calculate_conversion($amount, $from_rate, $to_rate);echo "<h2>兑换结果</h2>";echo "<p>$amount $from_currency = $converted_amount $to_currency</p>";} else {echo "<p>无效的货币类型。</p>";}
}
?><!DOCTYPE html>
<html lang="zh">
<head><meta charset="UTF-8"><title>EACO 兑换小程序</title>
</head>
<body><h1>EACO 兑换小程序</h1><form method="post"><label for="from_currency">选择兑换货币:</label><select name="from_currency" id="from_currency"><option value="bitcoin">比特币 (BTC)</option><option value="ethereum">以太坊 (ETH)</option><option value="binancecoin">币安币 (BNB)</option><option value="solana">索拉纳 (SOL)</option><option value="dogecoin">狗狗币 (DOGE)</option><option value="avalanche-2">AVAX (AVAX)</option><option value="tether">泰达币 (USDT)</option><!-- 可以添加更多的货币 --></select><label for="to_currency">兑换到:</label><select name="to_currency" id="to_currency"><option value="bitcoin">比特币 (BTC)</option><option value="ethereum">以太坊 (ETH)</option><option value="binancecoin">币安币 (BNB)</option><option value="solana">索拉纳 (SOL)</option><option value="dogecoin">狗狗币 (DOGE)</option><option value="avalanche-2">AVAX (AVAX)</option><option value="tether">泰达币 (USDT)</option><!-- 可以添加更多的货币 --></select><label for="amount">兑换金额:</label><input type="number" name="amount" id="amount" step="any" required><button type="submit">兑换</button></form>
</body>
</html>