phpseclib doesn't upload correct file contents

Question

So what it does is successfully connects then uploads the file logo.png but the contents of the file isn't what was on web host or uploaded with html if i use a html upload code. What it puts in the file is the ACTUAL text between the second ' 's so for that very example the contents of logo.png is literally logo.png and not the picture.

require_once("ftp/vendor/autoload.php");

use phpseclib\Net\SFTP;

$sftp = new SFTP('SERVER');

if (!$sftp->login('USER', 'PW')) {
    throw new Exception('Login failed');
}

$sftp->put("/some/path/logo.png", "logo.png", NET_SFTP_LOCAL_FILE);

Answer 1

If you would read through the documentation, you would find out that the second argument of the put() function is $data, therefore not the file path, but the actual data to write:

function put($remote_file, $data, $mode = NET_SFTP_STRING, $start = -1, $local_start = -1)

By default, NetSFTP::put() does not read from the local filesystem. $data is dumped directly into $remotefile. [...]

To upload a local file, the easiest way is to read the content into one variable that will be passed to the put() function:

$data = file_get_contents("logo.png");
$sftp->put("/some/path/logo.png", $data);

Edit: You are probably using a new version of phpseclib, which renamed these constants to make them more object-like. With a new version, you should use

$sftp->put("/some/path/logo.png", "logo.png", SFTP::SOURCE_LOCAL_FILE);