Problem with data-binary

[catsAND]

Hello. Thanks for your script.
I tried convert dropbox api examples and got bug.

https://www.dropbox.com/developers/documentation/http/documentation#files-upload

curl -X POST https://content.dropboxapi.com/2/files/upload \
    --header "Authorization: Bearer <get access token>" \
    --header "Dropbox-API-Arg: {\"path\": \"/Homework/math/Matrices.txt\",\"mode\": \"add\",\"autorename\": true,\"mute\": false}" \
    --header "Content-Type: application/octet-stream" \
    --data-binary @local_file.txt

And we got:

// Generated by curl-to-PHP: http://incarnate.github.io/curl-to-php/
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, "https://content.dropboxapi.com/2/files/upload");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$post = array(
    "file" => "@" .realpath("local_file.txt")
);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
curl_setopt($ch, CURLOPT_POST, 1);

$headers = array();
$headers[] = "Authorization: Bearer <get access token>";
$headers[] = "Dropbox-Api-Arg: {\"path\": \"/Homework/math/Matrices.txt\",\"mode\": \"add\",\"autorename\": true,\"mute\": false}";
$headers[] = "Content-Type: application/octet-stream";
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

$result = curl_exec($ch);
if (curl_errno($ch)) {
    echo 'Error:' . curl_error($ch);
}
curl_close ($ch);

Error in postfilds. Correct variant:

curl_setopt($ch, CURLOPT_POSTFIELDS, file_get_contents(local_file.txt));