通过PHP如何对接阿里云支付接口实现在线支付功能

<?php
// 阿里云支付接口配置
$gateway = '支付宝网关';
$appId = '你的应用Id';
$publicKey = '你的支付宝公钥';
$privateKey = '你的支付宝私钥';

// 支付参数
$orderId = '订单号';
$amount = '支付金额';

// 生成签名
$signParams = [
    'app_id' => $appId,
    'method' => 'alipay.trade.page.pay',
    'charset' => 'utf-8',
    // 填写你的其他支付参数
];
ksort($signParams);
$signStr = '';
foreach ($signParams as $key => $value) {
    $signStr .= $key . '=' . $value . '&';
}
$signStr = trim($signStr, '&');
$sign = rsaSign($signStr, $privateKey, 'RSA2');

// 发起支付请求
$url = $gateway . '?' . $signStr . '&sign=' . urlencode($sign);
echo '<script>location.href="' . $url . '";</script>';

// RSA2签名
function rsaSign($data, $privateKey, $signType = 'RSA2')
{
    $priKey = openssl_get_privatekey($privateKey);
    openssl_sign($data, $sign, $priKey, $signType);
    openssl_free_key($priKey);
    $sign = base64_encode($sign);
    return $sign;
}