PHP curl post调用用于上传带有其他属性的图像

我正在使用一个基本的PHP curl来发布数据到iNaturalist API调用，但我得到内部服务器错误。

我的HTML代码是:

<!DOCTYPE html>
    <html>
    <body>
    <form action="imageuploaddir.php" method="post" enctype="multipart/form-data">
        Select image to upload:
        <input type="file" name="fileToUpload" id="fileToUpload">
        <input type="submit" value="Upload Image" name="submit">
    </form>
    </body>
    </html>

我的imageuploaddir.php代码是

 <?php
$authorization = "Authorization: Bearer ###somekey;
$file=$_FILES["fileToUpload"];
$postfields = array('file' =>'@'.$file,'observation_photo[observation_id]'=> 4230809);
var_dump($postfields);
$ch =curl_init();
curl_setopt($ch,CURLOPT_URL,"http://www.inaturalist.org/observation_photos");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_HEADER,FALSE);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
curl_setopt($ch, CURLOPT_VERBOSE,1);
curl_setopt($ch, CURLOPT_POST,TRUE);
curl_setopt($ch, CURLOPT_POSTFIELDS,$postfields);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
  "Content-Type: multipart/form-data",
  $authorization
));
$response = curl_exec($ch);
$err = curl_error($ch);
curl_close($ch);
if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
?>


 $postfields = array('file' =>'@'.$file,'observation_photo[observation_id]'=> 4230809);

当我以这种格式发布帖子时，我得到一个错误:

注意:数组到字符串的转换

我更改了postfields数组并将CURLOPT_SAFE_UPLOAD设置为false以成功将图像和其他属性发布到API。

$postfields =  array(
      'file' =>
          '@'            . $_FILES['fileToUpload']['tmp_name']
          . ';filename=' . $_FILES['fileToUpload']['name']
          . ';type='     . $_FILES['fileToUpload']['type']
    ,'observation_photo[observation_id]'=>4230809);

我还设置CURLOPT_SAFE_UPLOAD为false curl_setopt($ch,CURLOPT_SAFE_UPLOAD,false);

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