/**
* Returns the last modified time of the given file.
* Return -1 on error
*
* @param string $remoteFile
* @param string|null $format
*
* @return int
*/
public function modifiedTime($remoteFile, $format = null)
{
$time = $this->ftp->mdtm($remoteFile);
if ($time !== -1 && $format !== null) {
return date($format, $time);
}
return $time;
}
