<?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
 *
 */
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);
	}
}
?>

实例部分：
index.php

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

$config = array(
            'hostname' => '192.168.1.254',
            'username' => '51somaccdata',
            'password' => 'Soma123456',
            'port' => 21
                );

$ftp = new Ftp();

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