Another php FTP upload class

/**
 php ftp upload class
 link: bbs.it-home.org
 date: 2013/2/25
*/
//R FTP processing;
class ftp {
var $ftpUrl = '58.123.24.32';
var $ftpUser = 'test123';
 var $ftpPass = 'yourpassword';
var $ftpDir = '/others/';
var $ftpR = ''; //R ftp resource;
var $status = '';
//R 1: Success; 2 :Unable to connect ftp;3: User error;
function ftp() {
 if ($this->ftpR = ftp_connect($this->ftpUrl, 21)) {
 if (ftp_login($this->ftpR , $this->ftpUser, $this->ftpPass)) {
 if (!empty($this->ftpDir)) {
 ftp_chdir($this->ftpR, $this->ftpDir);
 }
 ftp_pasv($this->ftpR, true);//R Enable passive mode;
 $this->status = 1;
 } else {
 $this->status = 3;
 }
 } else {
 $this->status = 2;
 }
}
//R Switch directory;
function cd($dir) {
 return ftp_chdir($this->ftpR, $dir);
}
/ /R Return the current path;
function pwd() {
 return ftp_pwd($this->ftpR);
}
//R Upload files;
function put($localFile, $remoteFile = '') {
 if ($remoteFile == '') {
 $remoteFile = end(explode('/', $localFile));
 }
 $res = ftp_nb_put($this->ftpR, $remoteFile, $localFile, FTP_BINARY);
 while ($res == FTP_MOREDATA) {
 $res = ftp_nb_continue($this->ftpR);
 }
 if ($res == FTP_FINISHED) {
 return true;
 } elseif ($res == FTP_FAILED) {
 return false;
 }
}
//R Download file;
function get($remoteFile, $localFile = '') {
 if ($localFile == '') {
 $localFile = end(explode(' /', $remoteFile));
 }
 if (ftp_get($this->ftpR, $localFile, $remoteFile, FTP_BINARY)) {
 $flag = true;
 } else {
 $flag = false;
 }
 return $flag;
}
//R file size;
function size($file) {
 return ftp_size($this->ftpR, $file);
}
//R whether the file exists;
function isFile ($file) {
 if ($this->size($file) >= 0) {
 return true;
 } else {
 return false;
 }
}
//R file time
function fileTime( $file) {
 return ftp_mdtm($this->ftpR, $file);
}
//R delete file;
function unlink($file) {
 return ftp_delete($this->ftpR, $file) ;
}
function nlist($dir = '/service/resource/') {
 return ftp_nlist($this->ftpR, $dir);
}
//R Close the connection;
function bye() {
 return ftp_close($this->ftpR);
}
}
?>