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