PHPを使用してWeChatアプレットのタスク共有機能を開発するにはどうすればよいですか?

{
  "title": "完成任务",
  "content": "完成任务并分享给好友",
  "image": "http://example.com/task.png"
}

$appid = 'your_appid';
$secret = 'your_appsecret';

$accessToken = getAccessToken($appid, $secret); // 获取访问令牌

$apiUrl = 'https://api.weixin.qq.com/wxa/getwxacode?access_token='.$accessToken;

$postData = array(
  'path' => 'pages/index', // 小程序的页面路径，可以根据实际需求修改
  'width' => 128, // 小程序码的宽度，可以根据实际需求修改
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $apiUrl);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($postData));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);

file_put_contents('/path/to/task.png', $response); // 将小程序码保存为图片文件

$code = $_GET['code']; // 从小程序端获取用户的code
$url = 'https://api.weixin.qq.com/sns/jscode2session?appid='.$appid.'&secret='.$secret.'&js_code='.$code.'&grant_type=authorization_code';

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);

$result = json_decode($response, true);
$openid = $result['openid']; // 用户的openid

$task = array(
  "title" => "完成任务",
  "content" => "完成任务并分享给好友",
  "image" => "http://example.com/task.png"
);

$shareLink = 'http://example.com/share.php?task='.urlencode(json_encode($task)).'&openid='.$openid;