问使用multipart/form-data POST请求时，从ConnectWise接口获取无效响应

EN

 function post_ticket_attachment ( $ticket_id, $file_attachment ) {
     $url = "https://api-na.myconnectwise.net/v4_6_release/apis/3.0/system/documents";
     $filename = $file_attachment['name'];
     $filedata = $file_attachment['tmp_name'];
     $filesize = $file_attachment['size'];


     $fields = array ( 
        "recordId" => $ticket_id, 
        "recordType" => "Ticket",
        "title" => $file_attachment['name']
     );

     $filenames = array($filedata);
     $files = array();
     foreach( $filenames as $f ){
         $files[$f] = file_get_contents($f);
     }

     $ch = curl_init();
     $boundary = uniqid();
     $delimiter = '-------------' . $boundary;

     $post_data = build_data_files($boundary, $fields, $files);

     curl_setopt_array($ch, array(
      CURLOPT_URL => $url,
      CURLOPT_RETURNTRANSFER => 1,
      CURLOPT_MAXREDIRS => 10,
      CURLOPT_TIMEOUT => 30,
      CURLOPT_CUSTOMREQUEST => "POST",
      CURLOPT_POST => 1,
      CURLOPT_POSTFIELDS => $post_data,
      CURLOPT_HTTPHEADER => array(
        "Authorization: basic " . $connect_wise_auth,
        "Content-Type: multipart/form-data; boundary=" . $delimiter,
        "Content-Length: " . strlen($post_data)
      ),
     ));

     $response = curl_exec($ch);
     console_log ($response);
}

function build_data_files($boundary, $fields, $files){
    $data = '';
    $eol = "\r\n";

    $delimiter = '-------------' . $boundary;

    foreach ($fields as $name => $content) {
        $data .= "--" . $delimiter . $eol
            . 'Content-Disposition: form-data; name="' . $name . "\"".$eol.$eol
            . $content . $eol;
    }


    foreach ($files as $name => $content) {
        $data .= "--" . $delimiter . $eol
            . 'Content-Disposition: form-data; name="' . $name . '"; filename="' . $name . '"' . $eol
            . 'Content-Transfer-Encoding: binary'.$eol
            ;

        $data .= $eol;
        $data .= $content . $eol;
    }
    $data .= "--" . $delimiter . "--".$eol;


    return $data;
}