$ftp_host = "yourFTPHost";
$ftp_user = "yourUsername";
$ftp_password = "yourPassword";
$conn = ftp_connect($ftp_host);
ftp_login($conn, $ftp_user, $ftp_password);
ftp_pasv($conn, TRUE);
$file_list = ftp_nlist($conn, "");
foreach ($file_list as $file)
{
  echo "<br>$file";
}
ftp_close($conn);