ftp_base::filesize

	function filesize($pathname) {
		if(!isset($this->_features["SIZE"])) {
			$this->PushError("filesize", "not supported by server");
			return FALSE;
		}
		if(!$this->_exec("SIZE ".$pathname, "filesize")) return FALSE;
		if(!$this->_checkCode()) return FALSE;
		return preg_replace("/^[0-9]{3} ([0-9]+).*$/s", "\\1", $this->_message);
	}