$ch = curl_init($upload_url);
$curlfile = curl_file_create(__DIR__.'1.jpg', 'multipart/form-data', 'file');
$data = array("file"=>$curlfile);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

$content = curl_exec($ch);