Downloading a folder through with FTP using PHP

问题:

How can i donwload a folder from a remote host using FTP And PHP?

I have username and password and the folder to donwload...

copy()?

Let me know, thanks!

回答1:

<?php 
$ftp_server = "ftp.example.com"; 
$conn_id = ftp_connect ($ftp_server) 
    or die("Couldn't connect to $ftp_server"); 

$login_result = ftp_login($conn_id, "user", "pass"); 
if ((!$conn_id) || (!$login_result)) 
    die("FTP Connection Failed"); 

ftp_sync ("DirectoryToCopy");    // Use "." if you are in the current directory 

ftp_close($conn_id);  

// ftp_sync - Copy directory and file structure 
function ftp_sync ($dir) { 

    global $conn_id; 

    if ($dir != ".") { 
        if (ftp_chdir($conn_id, $dir) == false) { 
            echo ("Change Dir Failed: $dir<BR>\r\n"); 
            return; 
        } 
        if (!(is_dir($dir))) 
            mkdir($dir); 
        chdir ($dir); 
    } 

    $contents = ftp_nlist($conn_id, "."); 
    foreach ($contents as $file) { 

        if ($file == '.' || $file == '..') 
            continue; 

        if (@ftp_chdir($conn_id, $file)) { 
            ftp_chdir ($conn_id, ".."); 
            ftp_sync ($file); 
        } 
        else 
            ftp_get($conn_id, $file, $file, FTP_BINARY); 
    } 

    ftp_chdir ($conn_id, ".."); 
    chdir (".."); 

} 
?>

Source: http://www.php.net/manual/es/function.ftp-get.php#90910

回答2:

You have these choises:

• ftp wrapper:

  $handle = opendir('ftp://user:password@host/path/to/dir') || die();
  
  while (false !== ($file = readdir($handle))) {
    if(is_file($file)){
      $c = file_get_contents($file);
      file_put_contents('/local/'.basename($file), $c);
    }
  }
  
  closedir($handle);
  

• using ftp extension of php

  $c = ftp_connect('picasse.com');
  ftp_login($c, 'file', 'password');
  ftp_chdir($c, '/remote/dir');
  $contents = ftp_nlist($c, '-la .');
  foreach($contents as $line){
    $file = preg_split('@\s+@', trim($line));
    $name = $file[8];
    $size = $file[4];
    $mode = $file[0];
    if(substr($mode, 0, 1) == '-'){
      //file
      $fd = fopen('/local/path/'.$name, 'w');
      ftp_fget ($c, $fd, $name, FTP_BINARY);
      fclose($fd);
    }else{
      //dir
    }
  }
  

• use external program like wget or lftp

  • wget --recursive [options] ftp://user:password@host/ # see wget --help

  • lftp -c commands.txt # where commands.txt would be something like:

    connect user:[e-mail]
    mget /path/to/remote /path/to/local
    

回答3:

You can use the FTP functions in PHP:

http://www.php.net/manual/en/ref.ftp.php

EDIT:

See also: PHP download entire folder (recursive) via FTP

回答4:

I've just released 2 new libraries to do such things in FTP / SFTP

Recursively copy files and folders on remote SFTP server (If local_path ends with a slash upload folder content otherwise upload folder itself)

Ftp::upload_dir($server, $user, $password, $local_path, $remote_path, $port = 22);

Download a directory from remote FTP server (If remote_dir ends with a slash download folder content otherwise download folder itself)

Ftp::download_dir($server, $user, $password, $remote_dir, $local_dir, 

$port = 22);

For the code here it is but you will need the entire class for small utilities functions dependencies.

/**
 * Download a directory from remote FTP server
 *
 * If remote_dir ends with a slash download folder content
 * otherwise download folder itself
 *
 * @param string $server 
 * @param string $user
 * @param string $password
 * @param string $remote_dir
 * @param string $local_dir
 * @param int $port
 *
 * @return bool $downloaded
 *
 */
public static function download_dir($server, $user, $password, $remote_dir, $local_dir, $port = 21)
{
    $downloaded = false;
    try
    {
        if(is_dir($local_dir) && is_writable($local_dir))
        {
            if(false !== $cid = Ftp::login($server, $user, $password, $port))
            {
                # If remote_dir do not ends with /
                if(!HString::ends_with($remote_dir, '/'))
                {
                    # Create fisrt level directory on local filesystem
                    $local_dir = rtrim($local_dir, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR . basename($remote_dir);
                    mkdir($local_dir);
                }

                # Remove trailing slash
                $local_dir = rtrim($local_dir, DIRECTORY_SEPARATOR);
                $downloaded = Ftp::download_all($cid, $remote_dir, $local_dir); 
                ftp_close($cid); 
            }
        }
        else
        {
            throw new Exception("Local directory does not exist or is not writable", 1);
        }
    }
    catch(Exception $e)
    {
        error_log("Ftp::download_dir : " . $e->getMessage());
    }
    return $downloaded;
}
/**
 * Recursive function to download remote files
 *
 * @param ressource $cid
 * @param string $remote_dir
 * @param string $local_dir
 *
 * @return bool $download_all
 *
 */
private static function download_all($cid, $remote_dir, $local_dir)
{
    $download_all = false;
    try
    {
        if(Ftp::is_dir($remote_dir, $cid))
        {
            $files = ftp_nlist($cid, $remote_dir);
            if($files!==false)
            {
                $to_download = 0;
                $downloaded = 0;
                # do this for each file in the remote directory 
                foreach ($files as $file)
                {
                    # To prevent an infinite loop 
                    if ($file != "." && $file != "..")
                    {
                        $to_download++;
                        # do the following if it is a directory 
                        if (Ftp::is_dir($file, $cid))// $remote_dir . DIRECTORY_SEPARATOR .
                        {                                
                            # Create directory on local filesystem
                            mkdir($local_dir . DIRECTORY_SEPARATOR . basename($file));

                            # Recursive part 
                            if(Ftp::download_all($cid, $file, $local_dir . DIRECTORY_SEPARATOR . basename($file)))
                            {
                                $downloaded++;
                            }
                        }
                        else
                        { 
                            # Download files 
                            if(ftp_get($cid, $local_dir . DIRECTORY_SEPARATOR . basename($file), $file, FTP_BINARY))
                            {
                                $downloaded++;
                            }
                        } 
                    }
                }
                # Check all files and folders have been downloaded
                if($to_download===$downloaded)
                {
                    $download_all = true;
                }
            }
        }
    }
    catch(Exception $e)
    {
        error_log("Ftp::download_all : " . $e->getMessage());
    }
    return $download_all;
}