深入PHP FTP类的详解
深入PHP FTP类的详解
http://www.jb51.net/article/38408.htm
FTP是一种文件传输协议,它支持两种模式,一种方式叫做Standard (也就是Active,主动方式),一种是 Passive (也就是PASV,被动方式)。 Standard模式 FTP 的客户端发送 PORT 命令到FTP server。Passive模式FTP的客户端发送 PASV命令到 FTP Server。下面介绍一个这两种方式的工作原理:
Standard模式
FTP 客户端首先和FTP Server的TCP 21端口建立连接,通过这个通道 发送命令,客户端需要接收数据的时候在这个通道上发送PORT命令。 PORT命令包含 了客户端用什么端口接收数据。在传送数据的时候,服务器端通过自己的TCP 20端口发送数据。 FTP server必须和客户端建立一个新的连接用来传送数据。
Passive模式
在建立控制通道的时候和Standard模式类似,当客户端通过这个通道发送PASV 命令的时候,FTP server打开一个位于1024和5000之间的随机端口并且通知 客户端在这个端口上传送数据的请求,然后FTP server 将通过这个端口进行数据的传送,这个时候FTP server不再需要建立一个新的和客户端之间的连接。使用PHP操作FTP-用法
复制代码代码如下:
// 联接FTP服务器
$conn = ftp_connect(ftp.server.com);
// 使用username和password登录ftp_login($conn, “john”, “doe”);
// 获取远端系统类型ftp_systype($conn);
// 列示文件$filelist = ftp_nlist($conn, “.”);
// 下载文件ftp_get($conn, “data.zip”, “data.zip”, FTP_BINARY);
// 关闭联接ftp_quit($conn);
//初结化一个FTP联接,PHP提供了ftp_connect()这个函数,它使用主机名称和端口作为参数。在上面的例子里,主机名字为 “ftp.server.com”;如果端口没指定,PHP将会使用“21”作为缺省端口来建立联接。
//联接成功后ftp_connect()传回一个handle句柄;这个handle将被以后使用的FTP函数使用。$conn = ftp_connect(ftp.server.com);
//一旦建立联接,使用ftp_login()发送一个用户名称和用户密码。你可以看到,这个函数ftp_login()使用了 ftp_connect()函数传来的handle,以确定用户名和密码能被提交到正确的服务器。ftp_login($conn, “john”, “doe”);
// close connectionftp_quit($conn);
//登录了FTP服务器,PHP提供了一些函数,它们能获取一些关于系统和文件以及目录的信息。ftp_pwd()
//获取当前所在的目录$here = ftp_pwd($conn);
//获取服务器端系统信息ftp_systype()$server_os = ftp_systype($conn);
//被动模式(PASV)的开关,打开或关闭PASV(1表示开)ftp_pasv($conn, 1);
//进入目录中用ftp_chdir()函数,它接受一个目录名作为参数。ftp_chdir($conn, “public_html”);
//回到所在的目录父目录用ftp_cdup()实现ftp_cdup($conn);
//建立或移动一个目录,这要使用ftp_mkdir()和ftp_rmdir()函数;注意:ftp_mkdir()建立成功的话,就会返回新建立的目录名。ftp_mkdir($conn, “test”);
ftp_rmdir($conn, “test”);
//上传文件,ftp_put()函数能很好的胜任,它需要你指定一个本地文件名,上传后的文件名以及传输的类型。比方说:如果你想上传 “abc.txt”这个文件,上传后命名为“xyz.txt”,命令应该是这样:ftp_put($conn, “xyz.txt”, “abc.txt”, FTP_ASCII);
//下载文件:PHP所提供的函数是ftp_get(),它也需要一个服务器上文件名,下载后的文件名,以及传输类型作为参数,例如:服务器端文件为his.zip,你想下载至本地机,并命名为hers.zip,命令如下:ftp_get($conn, “hers.zip”, “his.zip”, FTP_BINARY);
//PHP提供两种方法:一种是简单列示文件名和目录,另一种就是详细的列示文件的大小,权限,创立时间等信息。
//第一种使用ftp_nlist()函数,第二种用ftp_rawlist().两种函数都需要一个目录名做为参数,都返回目录列做为一个数组,数组的每一个元素相当于列表的一行。$filelist = ftp_nlist($conn, “.”);
//函数ftp_size(),它返回你所指定的文件的大小,使用BITES作为单位。要指出的是,如果它返回的是 “-1”的话,意味着这是一个目录$filelist = ftp_size($conn, “data.zip”);
?>
FTP类
复制代码代码如下:
/**
* 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;
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*/
DEMO
复制代码代码如下:
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’);
/*End of file ftp_demo.php*/
/*Location: /htdocs/ftp_demo.php*/

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