Php 如何使用freshdesk api创建带有附件的票证？

我正在使用freshdesk，我正在尝试使用API发送带有附件的票证。我根据示例代码创建了包含自定义字段和不包含自定义字段的票证，但在创建包含附件的票证时遇到了问题。我不知道我做这件事的方向是否正确，有人能帮忙吗？我会非常感激的。多谢各位

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在请求的标题中，

内容类型应为
多部分/表单数据


使用产品API只能附加本地计算机上的文件
对于带有附件的创建/更新请求，内容类型都应在上面
附加文件后会保留文件名，即响应中发送的文件名将与请求中的文件名相同
需要更多的帮助

PS：如果编程语言有任何问题，我不是php开发人员

$api_key = $APIKEY;
$password = $PASSWORD;
$yourdomain = $DOMAIN;

$selectvalue = $_POST["inquiryselect"];
$selectvalue2 = $_POST["inquiryselect2"];

$message = $_POST["message"];

$fullname = $_POST["fullname"];
$contact = $_POST["contact"];
$email = $_POST["email"];
$custtype = $_POST["customer-type"];
$subject = $_POST["subject"];
$message = $_POST["message"];
$clientproject = $_POST['customer-project'];

/* File Variables */

$file = $_FILES['user-upload'];
$fileName = $_FILES['user-upload']['name'];
$fileTmpName = $_FILES['user-upload']['tmp_name'];
$fileSize = $_FILES['user-upload']['size'];
$fileError = $_FILES['user-upload']['error'];
$fileType = $_FILES['user-upload']['type'];


$fileExt = explode('.', $fileName);
$fileActualExt = strtolower(end($fileExt));
$fileUniqueID = uniqid('', true).".".$fileActualExt;

echo $fileUniqueID;

$allowed = array('jpg', 'jpeg', 'png', 'pdf');

/* File Variable End */

if ($selectvalue == "Request")
{ 

  $custom_fields = array("cf_concern_type" => $selectvalue,
                         "cf_customer_type" => $custtype,
                         "cf_concern2" => $selectvalue2,
                         "cf_customer_role" => "External",
                         "cf_project" => $clientproject,                                             
);
  $ticket_data = json_encode(array(
    "name" => $fullname,
    "phone" => $contact,
    "subject" => $subject,
    "description" => $message,
    "email" => $email,
    "custom_fields" => $custom_fields,
    "priority" => 1,
    "status" => 2,
    'attachments[]' =>  curl_file_create($fileTmpName, $fileType, $fileName)
  ));
  $url = $URL;
  $ch = curl_init($url);
  $header[] = "Content-type: application/json";
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
  curl_setopt($ch, CURLOPT_HEADER, true);
  curl_setopt($ch, CURLOPT_USERPWD, "$api_key:$password");
  curl_setopt($ch, CURLOPT_POSTFIELDS, $ticket_data);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  $server_output = curl_exec($ch);
  $info = curl_getinfo($ch);
  $header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
  $headers = substr($server_output, 0, $header_size);
  $response = substr($server_output, $header_size);


if($info['http_code'] == 201) {
  echo "Ticket created successfully";
} else {
  if($info['http_code'] == 404) {
    echo "There was a problem submitting your form.";

  } else {
    echo "Error, HTTP Status Code : " . $info['http_code'] . "\n";
    echo "Headers are ".$headers;
    echo "Response are ".$response;

  }
}

curl_close($ch);
}