上传 
$this->load->library('ftp'); 
 
$config['hostname'] = 'ftp.example.com'; 
$config['username'] = 'your-username'; 
$config['password'] = 'your-password'; 
$config['debug']    = TRUE; 
 
$this->ftp->connect($config); 
//路径要绝对路径 
$this->ftp->upload('/local/path/to/myfile.html', '/public_html/myfile.html', 'ascii', 0775); 
 
$this->ftp->close();

下载文件列表 
$this->load->library('ftp'); 
 
$config['hostname'] = 'ftp.example.com'; 
$config['username'] = 'your-username'; 
$config['password'] = 'your-password'; 
$config['debug']    = TRUE; 
 
$this->ftp->connect($config); 
 
$list = $this->ftp->list_files('/public_html/'); 
 
print_r($list); 
 
$this->ftp->close();

<?php 
 
class ftp{ 
    public $hostname = ''; 
    public $username = ''; 
    public $password = ''; 
    public $port = 21; 
    public $passive = TRUE; 
    public $debug = FALSE; 
    protected $conn_id; 
 
    public function __construct($config =array()) 
    { 
        if(count($config)>0) 
        { 
            $this->initialize($config); 
        } 
    } 
 
    public function initialize($config) 
    { 
        foreach ($config as $key => $val) 
        { 
            if (isset($this->$key)) 
            { 
                $this->$key = $val; 
            } 
        } 
        $this->hostname = preg_replace('|.+?://|', '', $this->hostname); 
    } 
 
    public function connect($config = array()) 
    { 
        if (count($config) > 0) 
        { 
            $this->initialize($config); 
        } 
 
        if (FALSE === ($this->conn_id = @ftp_connect($this->hostname, $this->port))) 
        { 
            if ($this->debug === TRUE) 
            { 
                echo "ftp_unable_to_connect"; 
                exit(); 
            } 
            return FALSE; 
        } 
 
        if ( ! $this->_login()) 
        { 
            if ($this->debug === TRUE) 
            { 
                echo "ftp_unable_to_login"; 
                exit(); 
            } 
 
            return FALSE; 
        } 
 
        if ($this->passive === TRUE) 
        { 
            ftp_pasv($this->conn_id, TRUE); 
        } 
        return TRUE; 
    } 
 
    protected function _login() 
    { 
        return @ftp_login($this->conn_id, $this->username, $this->password); 
    } 
 
 
    protected function _is_conn() 
    { 
        if ( ! is_resource($this->conn_id)) 
        { 
            if ($this->debug === TRUE) 
            { 
                echo 'ftp_no_connection'; 
                exit(); 
            } 
 
            return FALSE; 
        } 
        return TRUE; 
    } 
 
 
    public function changedir($path, $suppress_debug = FALSE) 
    { 
        if ( ! $this->_is_conn()) 
        { 
            return FALSE; 
        } 
 
        $result = @ftp_chdir($this->conn_id, $path); 
 
        if ($result === FALSE) 
        { 
            if ($this->debug === TRUE && $suppress_debug === FALSE) 
            { 
                echo 'ftp_unable_to_changedir'; 
                exit(); 
            } 
 
            return FALSE; 
        } 
 
        return TRUE; 
    } 
 
    public function mkdir($path, $permissions = NULL) 
    { 
        if ($path === '' OR ! $this->_is_conn()) 
        { 
            return FALSE; 
        } 
 
        $result = @ftp_mkdir($this->conn_id, $path); 
 
        if ($result === FALSE) 
        { 
            if ($this->debug === TRUE) 
            { 
                echo 'ftp_unable_to_mkdir'; 
                exit(); 
            } 
 
            return FALSE; 
        } 
 
        if ($permissions !== NULL) 
        { 
            $this->chmod($path, (int) $permissions); 
        } 
 
        return TRUE; 
    } 
 
    public function upload($locpath, $rempath, $mode = 'auto', $permissions = NULL) 
    { 
        if ( ! $this->_is_conn()) 
        { 
            return FALSE; 
        } 
 
        if ( ! file_exists($locpath)) 
        { 
            echo 'ftp_no_source_file'; 
            return FALSE; 
        } 
 
        if ($mode === 'auto') 
        { 
            // Get the file extension so we can set the upload type 
            $ext = $this->_getext($locpath); 
            $mode = $this->_settype($ext); 
        } 
 
        $mode = ($mode === 'ascii') ? FTP_ASCII : FTP_BINARY; 
 
        $result = @ftp_put($this->conn_id, $rempath, $locpath, $mode); 
 
        if ($result === FALSE) 
        { 
            if ($this->debug === TRUE) 
            { 
                echo 'ftp_unable_to_upload'; 
                exit(); 
            } 
 
            return FALSE; 
        } 
        if ($permissions !== NULL) 
        { 
            $this->chmod($rempath, (int) $permissions); 
        } 
 
        return TRUE; 
    } 
 
    public function download($rempath, $locpath, $mode = 'auto') 
    { 
        if ( ! $this->_is_conn()) 
        { 
            return FALSE; 
        } 
 
        if ($mode === 'auto') 
        { 
            // Get the file extension so we can set the upload type 
            $ext = $this->_getext($rempath); 
            $mode = $this->_settype($ext); 
        } 
 
        $mode = ($mode === 'ascii') ? FTP_ASCII : FTP_BINARY; 
 
        $result = @ftp_get($this->conn_id, $locpath, $rempath, $mode); 
 
        if ($result === FALSE) 
        { 
            if ($this->debug === TRUE) 
            { 
                echo 'ftp_unable_to_download'; 
                exit(); 
            } 
 
            return FALSE; 
        } 
 
        return TRUE; 
    } 
 
    public function delete_file($filepath) 
    { 
        if ( ! $this->_is_conn()) 
        { 
            return FALSE; 
        } 
 
        $result = @ftp_delete($this->conn_id, $filepath); 
 
        if ($result === FALSE) 
        { 
            if ($this->debug === TRUE) 
            { 
                echo 'ftp_unable_to_delete'; 
                exit(); 
            } 
            return FALSE; 
        } 
 
        return TRUE; 
    } 
 
    public function chmod($path, $perm) 
    { 
        if ( ! $this->_is_conn()) 
        { 
            return FALSE; 
        } 
 
        if (@ftp_chmod($this->conn_id, $perm, $path) === FALSE) 
        { 
            if ($this->debug === TRUE) 
            { 
                echo 'ftp_unable_to_chmod'; 
                exit(); 
            } 
 
            return FALSE; 
        } 
 
        return TRUE; 
    } 
 
    protected function _getext($filename) 
    { 
        return (($dot = strrpos($filename, '.')) === FALSE) 
            ? 'txt' 
            : substr($filename, $dot + 1); 
    } 
 
 
    protected function _settype($ext) 
    { 
        return in_array($ext, array('txt', 'text', 'php', 'phps', 'php4', 'js', 'css', 'htm', 'html', 'phtml', 'shtml', 'log', 'xml'), TRUE) 
            ? 'ascii' 
            : 'binary'; 
    } 
 
    public function close() 
    { 
        return $this->_is_conn() 
            ? @ftp_close($this->conn_id) 
            : FALSE; 
    } 
} 
$obj = new ftp(); 
 
$config['hostname'] = 'http://xia.com'; 
$config['username'] = 'web'; 
$config['password'] = 'web'; 
$config['debug']    = TRUE; 
 
$obj->connect($config); 
//路径要绝对路径 
$obj->upload("C:\\Users\\Administrator\\Desktop\\e.txt", '/www/3.txt', 'ascii', 0775); 
 
$obj->close();