How to get latest modified csv file values from ftp server and insert it into mysql table

Example:

            function getFtpConnection()
                {
                    static $connection = null;
                    if ($connection !== null) return $connection;
                    $host = '10.0.0.1';
                    $username = 'username';
                    $password = 'password';

                    // set up connection
                    if (!$connection = ftp_connect($host)) {
                        echo "couldn't connect to " . $host;
                        return false;
                    }
                    // login with username and password
                    if (!$login_result = ftp_login($connection, $username, $password)) {
                        echo "couldn't connect as " . $username;
                        return false;
                    }

                    return $connection;
                }
        function getCsvFiles()
            {
                if (!$connection = getFtpConnection()) return false;

                $folder = '/folder/';
                // get list of files on given path
                $files = ftp_nlist($connection, $folder);
                if (!count($files)) {
                    echo "folder is empty";
                    return false;
                }
                $csvFiles = array();
                foreach ($files as $file) {
                    if (!preg_match('~\w+.csv$~ism', $file)) continue;
                    $csvFiles[] = $folder . '/' . $file;
                }
                return $csvFiles;
            }
     function findNewestFile($files)
        {
            $mostRecent = array(
                'time' => 0,
                'file' => null
            );
            foreach ($files as $file) {
                // get the last modified time for the file
                $time = ftp_mdtm(getFtpConnection(), $file);
                if ($time > $mostRecent['time']) {
                    // this file is the most recent so far
                    $mostRecent['time'] = $time;
                    $mostRecent['file'] = $file;
                }
            }
            return $mostRecent['file'];
        }

// configuration
$dbtype = "mysql";
$dbhost = "localhost";
$dbname = "test";
$dbuser = "root";
$dbpass = "admin";

// database connection
$conn = new PDO("mysql:host=$dbhost;dbname=$dbname", $dbuser, $dbpass);

// All FTP files
$files = getCsvFiles();
// find newest file
$newestFile = findNewestFile($files);

// query
$sql = "INSERT INTO csv_files (newestFile) VALUES (:newestFile)";
$q = $conn->prepare($sql);
$q->execute(array(':newestFile' => $newestFile));