Ever tried to upload a file via PHP's cURL? Here is how I did it. I hope it well help someone.

php-curl-upload.php

// client side upload
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: multipart/form-data")); // i guess it's the default
curl_setopt($ch, CURLOPT_URL, 'http://url/to/upload');
curl_setopt($ch, CURLOPT_POST, true);
$file = curl_file_create('/path/to/your/file.zip');
$post = array('anyParameterYouNeed' => 'anyValue', 'fileArrayIndexOnServer' => $file);
curl_setopt($this->ch, CURLOPT_POSTFIELDS, $postData);
curl_exec($ch);

// and on the server side it looks like this
move_uploaded_file($_FILES['fileArrayIndexOnServer']['tmp_name'], '/upload/path/' . $_FILES['fileArrayIndexOnServer']['name']));
// all additional parameters are in the post array
echo $_POST[anyParameterYouNeed'];

Just found out, that the @filename syntax is deprecated, so the correct way is to use curl_file_create().

Great! Thanks!