通过ftp上传图像时，Pureftpd-upload

我试图通过使用PHP通过FTP将图像从一台服务器上传到另一台服务器。但是上传的数据显示.pureftpdupload.5809ed2f.15.7b36.24316ca6错误。我正在使用这个代码。

    $connection = 'servername';
    $username = 'xxxx';
    $password = 'yyyy';
    $local_file = 'http://servername/test.jpg';
    $remote_file = 'admin/files/company/test.jpg';
    $connection = ftp_connect($server);
    if (@ftp_login($connection, $username, $password)) {
        // successfully connected
        //echo 'connected';exit;
    } else {
        echo 'not connected';
        return false;
    }
    if (ftp_put($connection, $remote_file, $local_file, FTP_BINARY)) {
     echo "successfully uploaded'n";
    } else {
     echo "There was a problem while uploading 'n";
    }