如何通过PHP向多台IOS设备发送推送通知？

<?php
// 设备的设备标识符（Device Token）
$deviceTokens = array(
    'device_token_1',
    'device_token_2',
    // 添加更多设备标识符...
);

// 推送的内容
$message = array(
    'aps' => array(
        'alert' => '这是一条推送通知',
        'sound' => 'default',
        'badge' => 1
    )
);

// 将内容转换为JSON格式
$json = json_encode($message);

// 创建cURL资源
$ch = curl_init();

// 设置cURL选项
curl_setopt($ch, CURLOPT_URL, 'https://api.push.apple.com/3/device');
curl_setopt($ch, CURLOPT_PORT, 443);
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'apns-topic: your_bundle_id',
    'apns-push-type: alert'
));
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $json);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSLCERT, 'path_to_your_certificate.pem');
curl_setopt($ch, CURLOPT_SSLCERTPASSWD, 'your_certificate_password');

// 循环发送推送通知给每个设备
foreach ($deviceTokens as $deviceToken) {
    curl_setopt($ch, CURLOPT_POSTFIELDS, $json);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
        'apns-topic: your_bundle_id',
        'apns-push-type: alert',
        'apns-id: ' . uniqid()
    ));
    curl_setopt($ch, CURLOPT_POSTFIELDS, $json);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
        'apns-topic: your_bundle_id',
        'apns-push-type: alert',
        'apns-id: ' . uniqid(),
        'apns-expiration: 0',
        'apns-priority: 10',
        'apns-device-token: ' . $deviceToken
    ));

    // 执行cURL请求
    $result = curl_exec($ch);

    // 处理结果
    if ($result === false) {
        echo '发送推送通知失败: ' . curl_error($ch);
    } else {
        echo '发送推送通知成功';
    }
}

// 关闭cURL资源
curl_close($ch);
?>