$api_key = 'your-mailgun-api-key';
$domain = 'mg.yourdomain.com';
$url = "https://api.mailgun.net/v3/{$domain}/messages";

$data = [
    'from'    => '营销中心 ',
    'to'      => 'customer@example.com',
    'subject' => '春季大促，全场5折起！',
    'html'    => '
限时优惠，立即抢购
点击链接享受专属折扣：去购物
'
];

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($ch, CURLOPT_USERPWD, "api:$api_key");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

$result = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($http_code == 200) {
    echo "邮件发送成功";
} else {
    echo "发送失败，返回信息：" . $result;
}

// 假设从MySQL获取订阅用户
$users = [
    ['email' => 'user1@example.com', 'name' => '张三'],
    ['email' => 'user2@example.com', 'name' => '李四']
];

foreach ($users as $user) {
    $personalized_html = str_replace(
        '{name}',
        htmlspecialchars($user['name']),
        '
亲爱的{name}，本周会员专享活动开启！
'
    );

    $data = [
        'from'    => '会员中心 ',
        'to'      => $user['email'],
        'subject' => '专属福利已到账',
        'html'    => $personalized_html
    ];

    // 调用cURL发送（复用上述逻辑）
    send_via_mailgun($data); // 封装为函数更清晰
}