Supported Versions: PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8
Retrieves a file from the FTP server and writes it to a local file (non-blocking)
<?php ftp_nb_get(    FTP\Connection $ftp,    string $local_filename,    string $remote_filename,    int $mode = FTP_BINARY,    int $offset = 0): int|false