Connect FTP server through PHP using "league/flysystem-ftp" package and download file(s).

ftp_download.php

<?php

/**
 * 
 * I am using `league/flysystem-ftp` package for it
 * so make sure you install it before using this code.
 * if you are using composer then you can simply install
 * it using command `composer require league/flysystem-ftp:^3.0`
 * check the latest version on the package documentation.
 * 
**/


use League\Flysystem\Filesystem;
use League\Flysystem\Ftp\FtpConnectionOptions;
use League\Flysystem\Ftp\FtpAdapter;
use League\Flysystem\Ftp\NoopCommandConnectivityChecker;
use League\Flysystem\Ftp\FtpConnectionProvider;
use League\Flysystem\UnixVisibility\PortableVisibilityConverter;

/**
 * 
 * FTP_FILE = file name which you want to download from server, e.g. products.csv
 * LOCAL_FILE = name of the file after downloading on your system
 * 
**/

ftpGetFile("FTP_HOST", "FTP_USER", "USER_PASS", "FTP_PORT", "FTP_FILE", "LOCAL_FILE");


/* Download any file from server through FTP */
public function ftpGetFile($host, $user, $pass, $port, $ftp_file, $local_file)
{
    $adapter = getAdapter($host, $user, $pass, $port);
    $filesystem = new Filesystem($adapter);
    
    $path = "./"; //path of directory of remote file
    $listing = $filesystem->listContents($path, false); // get file lists
    foreach ($listing as $item) {
        if($ftp_file == $item->path()) {
            
            $response = $filesystem->readStream($item->path());
            $local_path = "{path_of_directory_to_save_file}".'/'.$local_file;
            file_put_contents($local_path, $response);
            return 1;
        }
    }
}

public function getAdapter($host, $user, $pass, $port)
{
    return new FtpAdapter(
        new FtpConnectionOptions(
            $host, // host (required)
            '/', //path
            $user, // username (required)
            $pass, // password
            $port //port
        ),
        new FtpConnectionProvider(),
        new NoopCommandConnectivityChecker(),
        PortableVisibilityConverter::fromArray([
            'file' => [
                'public' => 0640,
                'private' => 0604,
            ],
            'dir' => [
                'public' => 0740,
                'private' => 7604,
            ],
        ])
    );
}
?>