php FTP 从远程下载文件夹下所有文件 到本地

<?php
//参考 说明 ：http://www.nusphere.com/kb/phpmanual/function.ftp-nb-get.htm

<?php
$config = array(
            'hostname' => '',
            'username' => '',
            'password' => '',
            'port' => 21,
                );

$ftp = new Ftp();
//本地目录
$local_dir = '/apps/';
//远程目录
$remote_dir = './';

$ftp->connect($config);
$list = $ftp->filelist($remote_dir);
var_dump($list);
//先取出本地目录的所有文件，然后用本地目录跟远程目录文件做对比，有文件名一样的不做处理
if (!empty($list)){
    set_time_limit(0);
    foreach ($list as $k => $v) {
        $files = basename($v);
        $old_files = my_scandir($local_dir);
        // var_dump($old_files);
        echo $v . '---------'.$local_dir.'/'.$files."\r\n"; 

        if (in_array($files, $old_files)){
            echo 'ok!!!!';
            echo $v . '---------'.$local_dir.'/'.$files."\r\n"; 
        } else{
            $ftp->down_nb_get($local_dir.'/'.$files , $v );
        }

    }

}

$ftp->close();

// $ftp->upload('ftp_err.log','ftp_upload.log');
// $ftp->download('ftp_upload.log','ftp_download.log');

function down($one,$two,$config){

    $newftp = new Ftp();
    $newftp->connect($config);
    $re = $newftp->download($one,$two);

    $newftp->close();

}

function my_scandir($dir)
{   
    if(is_dir($dir)){
        $files = array();
        $child_dirs = scandir($dir);
        foreach($child_dirs as $child_dir){
            //'.'和'..'是Linux系统中的当前目录和上一级目录，必须排除掉，  
            //否则会进入死循环，报segmentation falt 错误
            if($child_dir != '.' && $child_dir != '..'){
                if(is_dir($dir.'/'.$child_dir)){
                    $files[$child_dir] = my_scandir($dir.'/'.$child_dir);
                }else{
                    $files[] = $child_dir;
                }
            }
        }
        return $files;
    }else{
        return $dir;
    }
}

/**
 * 仿写CodeIgniter的FTP类
 * FTP基本操作：
 * 1) 登陆;           connect
 * 2) 当前目录文件列表;  filelist
 * 3) 目录改变;         chgdir
 * 4) 重命名/移动;       rename
 * 5) 创建文件夹;        mkdir
 * 6) 删除;               delete_dir/delete_file
 * 7) 上传;               upload
 * 8) 下载                download
 *
 * @author quanshuidingdang
 */
class Ftp {

    private $hostname   = '';
    private $username   = '';
    private $password   = '';
    private $port       = 21;
    private $passive    = TRUE;
    private $debug      = TRUE;
    public $conn_id    = FALSE;

    /**
     * 构造函数
     *
     * @param   array   配置数组 : $config = array('hostname'=>'','username'=>'','password'=>'','port'=>''...);
     */
    public function __construct($config = array()) {
        if(count($config) > 0) {
            $this->_init($config);
        }
    }

    /**
     * FTP连接
     *
     * @access  public
     * @param   array   配置数组
     * @return  boolean
     */
    public function connect($config = array()) {
        if(count($config) > 0) {
            $this->_init($config);
        }

        if(FALSE === ($this->conn_id = @ftp_connect($this->hostname,$this->port))) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_connect");
            }
            return FALSE;
        }

        if( ! $this->_login()) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_login");
            }
            return FALSE;
        }

        if($this->passive === TRUE) {
            ftp_pasv($this->conn_id, TRUE);
        }

        return TRUE;
    }

    /**
     * 目录改变
     *
     * @access  public
     * @param   string  目录标识(ftp)
     * @param   boolean 
     * @return  boolean
     */
    public function chgdir($path = '', $supress_debug = FALSE) {
        if($path == '' OR ! $this->_isconn()) {
            return FALSE;
        }

        $result = @ftp_chdir($this->conn_id, $path);

        if($result === FALSE) {
            if($this->debug === TRUE AND $supress_debug == FALSE) {
                $this->_error("ftp_unable_to_chgdir:dir[".$path."]");
            }
            return FALSE;
        }

        return TRUE;
    }

    /**
     * 目录生成
     *
     * @access  public
     * @param   string  目录标识(ftp)
     * @param   int     文件权限列表  
     * @return  boolean
     */
    public function mkdir($path = '', $permissions = NULL) {
        if($path == '' OR ! $this->_isconn()) {
            return FALSE;
        }

        $result = @ftp_mkdir($this->conn_id, $path);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_mkdir:dir[".$path."]");
            }
            return FALSE;
        }

        if( ! is_null($permissions)) {
            $this->chmod($path,(int)$permissions);
        }

        return TRUE;
    }

    /**
     * 上传
     *
     * @access  public
     * @param   string  本地目录标识
     * @param   string  远程目录标识(ftp)
     * @param   string  上传模式 auto || ascii
     * @param   int     上传后的文件权限列表  
     * @return  boolean
     */
    public function upload($localpath, $remotepath, $mode = 'auto', $permissions = NULL) {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        if( ! file_exists($localpath)) {
            if($this->debug === TRUE) {
                $this->_error("ftp_no_source_file:".$localpath);
            }
            return FALSE;
        }

        if($mode == 'auto') {
            $ext = $this->_getext($localpath);
            $mode = $this->_settype($ext);
        }

        $mode = ($mode == 'ascii') ? FTP_ASCII : FTP_BINARY;

        $result = @ftp_put($this->conn_id, $remotepath, $localpath, $mode);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_upload:localpath[".$localpath."]/remotepath[".$remotepath."]");
            }
            return FALSE;
        }

        if( ! is_null($permissions)) {
            $this->chmod($remotepath,(int)$permissions);
        }

        return TRUE;
    }

    /**
     * 下载
     *
     * @access  public
     * @param   string  远程目录标识(ftp)
     * @param   string  本地目录标识
     * @param   string  下载模式 auto || ascii  
     * @return  boolean
     */
    public function download($remotepath, $localpath, $mode = 'auto') {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        if($mode == 'auto') {
            $ext = $this->_getext($remotepath);
            $mode = $this->_settype($ext);
        }

        $mode = ($mode == 'ascii') ? FTP_ASCII : FTP_BINARY;

        $result = @ftp_get($this->conn_id, $localpath, $remotepath, $mode);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_download:localpath[".$localpath."]-remotepath[".$remotepath."]");
            }
            return FALSE;
        }

        return TRUE;
    }

    public function down_nb_get($remotepath, $localpath,$mode = 'auto'){

        if( ! $this->_isconn()) {
            return FALSE;
        }

        if($mode == 'auto') {
            $ext = $this->_getext($remotepath);
            $mode = $this->_settype($ext);
        }
        $mode = ($mode == 'ascii') ? FTP_ASCII : FTP_BINARY;

        $ret = @ftp_nb_get($this->conn_id, $remotepath, $localpath, $mode);
        while ($ret == FTP_MOREDATA) {

           // Do whatever you want
           // Continue downloading...
           $ret = ftp_nb_continue($this->conn_id);
        }
        if ($ret != FTP_FINISHED) {
           echo "There was an error downloading the file...";
           return false;
        } else{
            return true;
        }

    }

    /**
     * 重命名/移动
     *
     * @access  public
     * @param   string  远程目录标识(ftp)
     * @param   string  新目录标识
     * @param   boolean 判断是重命名(FALSE)还是移动(TRUE) 
     * @return  boolean
     */
    public function rename($oldname, $newname, $move = FALSE) {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        $result = @ftp_rename($this->conn_id, $oldname, $newname);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $msg = ($move == FALSE) ? "ftp_unable_to_rename" : "ftp_unable_to_move";
                $this->_error($msg);
            }
            return FALSE;
        }

        return TRUE;
    }

    /**
     * 删除文件
     *
     * @access  public
     * @param   string  文件标识(ftp)
     * @return  boolean
     */
    public function delete_file($file) {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        $result = @ftp_delete($this->conn_id, $file);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_delete_file:file[".$file."]");
            }
            return FALSE;
        }

        return TRUE;
    }

    /**
     * 删除文件夹
     *
     * @access  public
     * @param   string  目录标识(ftp)
     * @return  boolean
     */
    public function delete_dir($path) {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        //对目录宏的'/'字符添加反斜杠'\'
        $path = preg_replace("/(.+?)\/*$/", "\\1/", $path);

        //获取目录文件列表
        $filelist = $this->filelist($path);

        if($filelist !== FALSE AND count($filelist) > 0) {
            foreach($filelist as $item) {
                //如果我们无法删除,那么就可能是一个文件夹
                //所以我们递归调用delete_dir()
                if( ! @delete_file($item)) {
                    $this->delete_dir($item);
                }
            }
        }

        //删除文件夹(空文件夹)
        $result = @ftp_rmdir($this->conn_id, $path);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_delete_dir:dir[".$path."]");
            }
            return FALSE;
        }

        return TRUE;
    }

    /**
     * 修改文件权限
     *
     * @access  public
     * @param   string  目录标识(ftp)
     * @return  boolean
     */
    public function chmod($path, $perm) {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        //只有在PHP5中才定义了修改权限的函数(ftp)
        if( ! function_exists('ftp_chmod')) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_chmod(function)");
            }
            return FALSE;
        }

        $result = @ftp_chmod($this->conn_id, $perm, $path);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_chmod:path[".$path."]-chmod[".$perm."]");
            }
            return FALSE;
        }
        return TRUE;
    }

    /**
     * 获取目录文件列表
     *
     * @access  public
     * @param   string  目录标识(ftp)
     * @return  array
     */
    public function filelist($path = '.') {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        return ftp_nlist($this->conn_id, $path);
    }

    /**
     * 关闭FTP
     *
     * @access  public
     * @return  boolean
     */
    public function close() {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        return @ftp_close($this->conn_id);
    }

    /**
     * FTP成员变量初始化
     *
     * @access  private
     * @param   array   配置数组     
     * @return  void
     */
    private function _init($config = array()) {
        foreach($config as $key => $val) {
            if(isset($this->$key)) {
                $this->$key = $val;
            }
        }

        //特殊字符过滤
        $this->hostname = preg_replace('|.+?://|','',$this->hostname);
    }

    /**
     * FTP登陆
     *
     * @access  private
     * @return  boolean
     */
    private function _login() {
        return @ftp_login($this->conn_id, $this->username, $this->password);
    }

    /**
     * 判断con_id
     *
     * @access  private
     * @return  boolean
     */
    private function _isconn() {
        if( ! is_resource($this->conn_id)) {
            if($this->debug === TRUE) {
                $this->_error("ftp_no_connection");
            }
            return FALSE;
        }
        return TRUE;
    }

    /**
     * 从文件名中获取后缀扩展
     *
     * @access  private
     * @param   string  目录标识
     * @return  string
     */
    private function _getext($filename) {
        if(FALSE === strpos($filename, '.')) {
            return 'txt';
        }

        $extarr = explode('.', $filename);
        return end($extarr);
    }

    /**
     * 从后缀扩展定义FTP传输模式  ascii 或 binary
     *
     * @access  private
     * @param   string  后缀扩展
     * @return  string
     */
    private function _settype($ext) {
        $text_type = array (
                            'txt',
                            'text',
                            'php',
                            'phps',
                            'php4',
                            'js',
                            'css',
                            'htm',
                            'html',
                            'phtml',
                            'shtml',
                            'log',
                            'xml'
                            );

        return (in_array($ext, $text_type)) ? 'ascii' : 'binary';
    }

    /**
     * 错误日志记录
     *
     * @access  prvate
     * @return  boolean
     */
    private function _error($msg) {
        return @file_put_contents('ftp_err.log', "date[".date("Y-m-d H:i:s")."]-hostname[".$this->hostname."]-username[".$this->username."]-password[".$this->password."]-msg[".$msg."]\n", FILE_APPEND);
    }
}