我正在尝试找到一种从服务器到服务器传输文件的方法。源服务器可以是任何平台，除了它支持FTP之外，我们甚至可能都不知道它。
我在SO上发现的一些帖子建议使用scp，sftp，rsync或wget来实现此目的。鉴于这个PHP脚本每次都需要工作，我们唯一确定的是源服务器支持FTP，如何实现？
我在SO上找到了几个FTP示例，但它们没有得到很好的解释。
我们需要能够下载所有文件和文件夹，同时保持相同的目录结构。
答案 0 :(得分：2)
我找到了一个PHP类，可以轻松实现递归的FTP上传和下载。可以找到here
他们使用的代码如下（顶部的代码是下载，上传和错误检查的示例代码）：
<?php // example
set_time_limit(0);
require 'ftp.php';
$ftp = new ftp();
$ftp->conn('host', 'username', 'password');
$ftp->get('download/demo', '/demo'); // download live "/demo" folder to local "download/demo"
$ftp->put('/demo/test', 'upload/vjtest'); // upload local "upload/vjtest" to live "/demo/test"
$arr = $ftp->getLogData();
if ($arr['error'] != "")
echo '<h2>Error:</h2>' . implode('<br />', $arr['error']);
if ($arr['ok'] != "")
echo '<h2>Success:</h2>' . implode('<br />', $arr['ok']);
class ftp {
private $conn, $login_result, $logData, $ftpUser, $ftpPass, $ftpHost, $retry, $ftpPasv, $ftpMode, $verbose, $logPath, $createMask;
// --------------------------------------------------------------------
/**
* Construct method
*
* @param array keys[passive_mode(true|false)|transfer_mode(FTP_ASCII|FTP_BINARY)|reattempts(int)|log_path|verbose(true|false)|create_mask(default:0777)]
* @return void
*/
function __construct()
{
$this->retry = (isset($o['reattempts'])) ? $o['reattempts'] : 3;
$this->ftpPasv = (isset($o['passive_mode'])) ? $o['passive_mode'] : true;
$this->ftpMode = (isset($o['transfer_mode'])) ? $o['transfer_mode'] : FTP_BINARY;
$this->verbose = (isset($o['verbose'])) ? $o['verbose'] : false;
$this->logPath = (isset($o['log_path'])) ? $o['log_path'] : dirname(__FILE__).'\log';
$this->createMask = (isset($o['create_mask'])) ? $o['create_mask'] : 0777;
}
// --------------------------------------------------------------------
/**
* Connection method
*
* @param string hostname
* @param string username
* @param string password
* @return void
*/
public function conn($hostname, $username, $password)
{
$this->ftpUser = $username;
$this->ftpPass = $password;
$this->ftpHost = $hostname;
$this->initConn();
}
// --------------------------------------------------------------------
/**
* Init connection method - connect to ftp server and set passive mode
*
* @return bool
*/
function initConn()
{
$this->conn = ftp_connect($this->ftpHost);
$this->login_result = ftp_login($this->conn, $this->ftpUser, $this->ftpPass);
if($this->conn && $this->login_result)
{
ftp_pasv($this->conn, $this->ftpPasv);
return true;
}
return false;
}
// --------------------------------------------------------------------
/**
* Put method - upload files(folders) to ftp server
*
* @param string path to destionation file/folder on ftp
* @param string path to source file/folder on local disk
* @param int only for identify reattempt, dont use this param
* @return bool
*/
public function put($destinationFile, $sourceFile, $retry = 0)
{
if(file_exists($sourceFile))
{
if(!$this->isDir($sourceFile, true))
{
$this->createSubDirs($destinationFile);
if(!ftp_put($this->conn, $destinationFile, $sourceFile, $this->ftpMode))
{
$retry++;
if($retry > $this->retry)
{
$this->logData('Error when uploading file: '.$sourceFile.' => '.$destinationFile, 'error');
return false;
}
if($this->verbose) echo 'Retry: '.$retry."\n";
$this->reconnect();
$this->put($destinationFile, $sourceFile, $retry);
}
else
{
$this->logData('Upload:'.$sourceFile.' => '.$destinationFile, 'ok');
return true;
}
}
else
{
$this->recursive($destinationFile, $sourceFile, 'put');
}
}
}
// --------------------------------------------------------------------
/**
* Get method - download files(folders) from ftp server
*
* @param string path to destionation file/folder on local disk
* @param string path to source file/folder on ftp server
* @param int only for identify reattempt, dont use this param
* @return bool
*/
public function get($destinationFile, $sourceFile, $retry = 0)
{
if(!$this->isDir($sourceFile, false))
{
if($this->verbose)echo $sourceFile.' => '.$destinationFile."\n";
$this->createSubDirs($destinationFile, false, true);
if(!ftp_get($this->conn, $destinationFile, $sourceFile, $this->ftpMode))
{
$retry++;
if($retry > $this->retry)
{
$this->logData('Error when downloading file: '.$sourceFile.' => '.$destinationFile, 'error');
return false;
}
if($this->verbose) echo 'Retry: '.$retry."\n";
$this->reconnect();
$this->get($destinationFile, $sourceFile, $retry);
}
else
{
$this->logData('Download:'.$sourceFile.' => '.$destinationFile, 'ok');
return true;
}
}
else
{
$this->recursive($destinationFile, $sourceFile, 'get');
}
}
// --------------------------------------------------------------------
/**
* Make dir method - make folder on ftp server or local disk
*
* @param string path to destionation folder on ftp or local disk
* @param bool true for local, false for ftp
* @return bool
*/
public function makeDir($dir, $local = false)
{
if($local)
{
if(!file_exists($dir) && !is_dir($dir))return mkdir($dir, $this->createMask); else return true;
}
else
{
ftp_mkdir($this->conn,$dir);
return ftp_chmod($this->conn, $this->createMask, $dir);
}
}
// --------------------------------------------------------------------
/**
* Cd up method - change working dir up
*
* @param bool true for local, false for ftp
* @return bool
*/
public function cdUp($local)
{
return $local ? chdir('..') : ftp_cdup($this->conn);
}
// --------------------------------------------------------------------
/**
* List contents of dir method - list all files in specified directory
*
* @param string path to destionation folder on ftp or local disk
* @param bool true for local, false for ftp
* @return bool
*/
public function listFiles($file, $local = false)
{
if(!$this->isDir($file, $local))return false;
if($local)
{
return scandir($file);
}
else
{
if(!preg_match('/\//', $file))
{
return ftp_nlist($this->conn, $file);
}else
{
$dirs = explode('/', $file);
foreach($dirs as $dir)
{
$this->changeDir($dir, $local);
}
$last = count($dirs)-1;
$this->cdUp($local);
$list = ftp_nlist($this->conn, $dirs[$last]);
$i = 0;
foreach($dirs as $dir)
{
if($i < $last) $this->cdUp($local);
$i++;
}
return $list;
}
}
}
// --------------------------------------------------------------------
/**
* Returns current working directory
*
* @param bool true for local, false for ftp
* @return bool
*/
public function pwd($local = false)
{
return $local ? getcwd() : ftp_pwd($this->conn);
}
// --------------------------------------------------------------------
/**
* Change current working directory
*
* @param string dir name
* @param bool true for local, false for ftp
* @return bool
*/
public function changeDir($dir, $local = false)
{
return $local ? chdir($dir) : @ftp_chdir($this->conn, $dir);
}
// --------------------------------------------------------------------
/**
* Create subdirectories
*
* @param string path
* @param bool
* @param bool true for local, false for ftp
* @param bool change current working directory back
* @return void
*/
function createSubDirs($file, $last = false, $local = false, $chDirBack = true)
{
if(preg_match('/\//',$file))
{
$origin = $this->pwd($local);
if(!$last) $file = substr($file, 0, strrpos($file,'/'));
$dirs = explode('/',$file);
foreach($dirs as $dir)
{
if(!$this->isDir($dir, $local))
{
$this->makeDir($dir, $local);
$this->changeDir($dir, $local);
}
else
{
$this->changeDir($dir, $local);
}
}
if($chDirBack) $this->changeDir($origin, $local);
}
}
// --------------------------------------------------------------------
/**
* Recursion
*
* @param string destionation file/folder
* @param string source file/folder
* @param string put or get
* @return void
*/
function recursive($destinationFile, $sourceFile, $mode)
{
$local = ($mode == 'put') ? true : false;
$list = $this->listFiles($sourceFile, $local);
if($this->verbose) echo "\n".'Folder: '.$sourceFile."\n";
$this->logData(($mode=='get')?('Download:'):('Upload:').$sourceFile.' => '.$destinationFile, 'ok');
if($this->verbose) print_r($list);
$x=0;
$z=0;
if(count($list)==2)// blank folder
{
if($mode == 'get')
$this->makeDir($destinationFile, true);
if($mode == 'put')
$this->makeDir($destinationFile);
}
foreach($list as $file)
{
if($file == '.' || $file == '..')continue;
$destFile = $destinationFile.'/'.$file;
$srcFile = $sourceFile.'/'.$file;
if($this->isDir($srcFile,$local))
{
$this->recursive($destFile, $srcFile, $mode);
}
else
{
if($local)
{
$this->put($destFile, $srcFile);
}
else
{
$this->get($destFile, $srcFile);
}
}
}
}
// --------------------------------------------------------------------
/**
* Check if is dir
*
* @param string path to folder
* @return bool
*/
public function isDir($dir, $local)
{
if($local) return is_dir($dir);
if($this->changeDir($dir))return $this->cdUp(0);
return false;
}
// --------------------------------------------------------------------
/**
* Save log data to array
*
* @param string data
* @param string type(error|ok)
* @return void
*/
function logData($data, $type)
{
$this->logData[$type][] = $data;
}
// --------------------------------------------------------------------
/**
* Get log data array
*
* @return array
*/
public function getLogData()
{
return $this->logData;
}
// --------------------------------------------------------------------
/**
* Save log data to file
*
* @return void
*/
public function logDataToFiles()
{
if(!$this->logPath) return false;
$this->makeDir($this->logPath, true);
$log = $this->getLogData();
$sep = "\n".date('y-m-d H:i:s').' ';
if($log['error'] != "")
{
$logc = date('y-m-d H:i:s').' '.join($sep,$log['error'])."\n";
$this->addToFile($this->logPath.'/'.$this->ftpUser.'-error.log',$logc);
}
if($log['ok'] != "")
{
$logc = date('y-m-d H:i:s').' '.join($sep,$log['ok'])."\n";
$this->addToFile($this->logPath.'/'.$this->ftpUser.'-ok.log',$logc);
}
}
// --------------------------------------------------------------------
/**
* Reconnect method
*
* @return void
*/
public function reconnect()
{
$this->closeConn();
$this->initConn();
}
// --------------------------------------------------------------------
/**
* Close connection method
*
* @return void
*/
public function closeConn()
{
return ftp_close($this->conn);
}
// --------------------------------------------------------------------
/**
* Write to file
*
* @param string path to file
* @param string text
* @param string fopen mode
* @return void
*/
function addToFile($file, $ins, $mode = 'a')
{
$fp = fopen($file, $mode);
fwrite($fp,$ins);
fclose($fp);
}
// --------------------------------------------------------------------
/**
* Destruct method - close connection and save log data to file
*
* @return void
*/
function __destruct()
{
$this->closeConn();
$this->logDataToFiles();
}
}
// END ftp class
/* End of file ftp.php */
/* Location: ftp.php */
答案 1 :(得分：0)
这应该是一个评论，但它有点长。使用PHP通过FTP复制文件可能就像
一样简单file_put_contents($fname
, file_get_contents('FTP://ftp.example com/path/afile'));
但您对PHP代码的运行位置了解多少？
可能没有能力我们无法为您回答这些问题。因此，在您开始担心大量文件，目录和同步之前，您的第一步是使用类似的代码获取概念证明并运行。
为什么需要在PHP中实现它？