PHP通过curl上传客户端提交的文件到远程服务器

$ch = curl_init('http://127.0.0.0/upload');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, [
  'file' => new \CURLFile($_FILES['file']['tmp_name'])
]);

$result = curl_exec($ch);

if ($result === false) {
  $this->error("upload - FAILED");
}

$res = json_decode($result, true);