PHP curl ile dosya gönderme işlemi nasıl yapılır?

POST /uplodHTTP/1.1 
Host: domain.com/
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW 
 ------WebKitFormBoundary7MA4YWxkTrZu0gW 
     Content-Disposition: form-data; name="file"; filename="image.jpg" 
     Content-Type:
 ------WebKitFormBoundary7MA4YWxkTrZu0gW--

$ch = curl_init('http://siteadresi.com/');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, [
'postField1' => 'post içeriği 1',
'postField2' => 'post içeriği 2',
'fileName' => curl_file_create('./filepath.png')
]);
$result = curl_exec($ch);