仿CodeIgniter的FTP类的实现代码

<?php
/**
 * 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;
 private $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;
 }
 
 /**
  * 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);
 }
}

/*End of file ftp.php*/
/*Location /Apache Group/htdocs/ftp.php*/
?>

<?php
require_once('ftp.php');

$config = array(
   'hostname' => 'localhost',
   'username' => 'root',
   'password' => 'root',
   'port' => 21
    );
$ftp = new Ftp();

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

/*from http://bbs.it-home.org*/
/*End of file ftp_demo.php*/
/*Location: /htdocs/ftp_demo.php*/
?>