如何使用PHP开发微信小程序的打印服务功能？

$appId = 'your_app_id';  // 替换为你自己的小程序的AppID
$appSecret = 'your_app_secret';  // 替换为你自己的小程序的AppSecret

$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$appId."&secret=".$appSecret;

$response = file_get_contents($url);
$data = JSON_decode($response, true);

$accessToken = $data['access_token'];

$url = "Https://api.weixin.qq.com/wxa/uploadmedia?access_token=".$accessToken."&type=file";

$filePath = './path/to/your/file.pdf';  // 替换为你自己要上传的文件路径

$postData = array(
    'media' => new CurlFile($filePath)
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
curl_exec($ch);
curl_close($ch);

$url = "https://api.weixin.qq.com/wxa/addnearbyprinter?access_token=".$accessToken;

$postData = array(
    'open_id' => 'your_open_id',  // 替换为用户的OpenID
    'printer_id' => 'your_printer_id',  // 替换为打印机的ID
    'file_url' => 'your_file_url',  // 替换为文件的下载链接
    'origin_id' => 'your_origin_id',  // 替换为任务的唯一标识
    'preview' => 'true'  // 是否需要预览
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($postData));
curl_exec($ch);
curl_close($ch);

$url = "https://api.weixin.qq.com/wxa/querylist?access_token=".$accessToken;

$postData = array(
    'open_id' => 'your_open_id',  // 替换为用户的OpenID
    'origin_id' => 'your_origin_id'  // 替换为任务的唯一标识
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($postData));
curl_exec($ch);
curl_close($ch);