PHP:无法上载具有cURL的文件.在其他字段中使用@时出错

我试图使用cURL将照片发送到Telegram bot API，但当我在chat_id字段中使用"@"时，我会收到以下错误：
Deprecated: curl_setopt_array(): The usage of the @filename API for file uploading is deprecated. Please use the CURLFile class

这是我的代码：

$post = array('chat_id' => '@ameer_test', 'photo'=> new CURLFile('E:'wamp'www'test/content/uploads/sample.png'));
$curl = curl_init("https://api.telegram.org/bot122877145:AAH-mTygl1FeisuOnsESbCVerRqd6-DTxD0/sendPhoto");
curl_setopt_array($curl, array(
    //CURLOPT_HTTPHEADER => $headers,
    CURLOPT_SSL_VERIFYPEER => 0,
    CURLOPT_SSL_VERIFYHOST => 0,
    CURLOPT_RETURNTRANSFER => 1,
    CURLOPT_SAFE_UPLOAD => 0,
    CURLOPT_POST => 1,
    CURLOPT_POSTFIELDS => $post
    ));
$response = curl_exec($curl);
curl_close($curl);
var_dump($response);

如何告诉cURL这个@不是文件名。

谢谢！