<?php
/**
 * 彩虹易支付 PHP SDK 示例
 * 文档: https://xxkkfz.cn/apidoc.html
 */

function epay_submit($params, $merchant_key) {
    // 签名
    $sign_str = '';
    ksort($params);
    foreach ($params as $k => $v) {
        if ($k != 'sign' && $k != 'sign_type' && $v !== '') {
            $sign_str .= $k . '=' . $v . '&';
        }
    }
    $sign_str = rtrim($sign_str, '&');
    $params['sign'] = md5($sign_str . $merchant_key);
    $params['sign_type'] = 'MD5';
    
    // 请求
    $ch = curl_init('https://xxkkfz.cn/api/submit.php');
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    $response = curl_exec($ch);
    curl_close($ch);
    return json_decode($response, true);
}

// 使用示例
$result = epay_submit([
    'pid'          => '1001',
    'type'         => 'alipay',
    'out_trade_no' => 'ORDER' . time(),
    'notify_url'   => 'https://你的域名/notify.php',
    'return_url'   => 'https://你的域名/return.php',
    'name'         => '测试商品',
    'money'        => '0.01',
], '你的商户密钥');

print_r($result);