php socket编程 ftp下载文件

<?php
  $ftp_host = "ftp ipaddress";//ftp ip地址
  $ftp_user = "username";//用户名
  $ftp_pass = "password";//密码

  $ftp = new ftp();

  $ftp->debug = TRUE;

  if (!$ftp->ftp_connect($ftp_host)) {
  die("Cannot connect\n");
  }

  if (!$ftp->ftp_login($ftp_user, $ftp_pass)) {
  $ftp->ftp_quit();
  die("Login failed\n");
  }

  if ($pwd = $ftp->ftp_pwd()) {
  echo "Current directory is ".$pwd."\n";
  } else {
  $ftp->ftp_quit();
  die("Error!!\n");
  }
 
  $ftp->ftp_chdir('wwwroot');//切换到wwwroot目录
  $ftp->ftp_get('G:\TempFile\about.html', 'about.html',0);//下载about.html文件到G:\TempFile\目录下
 
$ftp->ftp_quit();

/* * *******************************************************************
 *
 *    PHP FTP Client Class By TOMO ( [e-mail] )
 *
 *  - Version 0.12 (2002/01/11)
 *  - This script is free but without any warranty.
 *  - You can freely copy, use, modify or redistribute this script
 *    for any purpose.
 *  - But please do not erase this information!!.
 *
 * ****************************************************************** */



/* * *******************************************************************
  Example

  $ftp_host = "ftp.example.com";
  $ftp_user = "username";
  $ftp_pass = "password";

  $ftp = new ftp();

  $ftp->debug = TRUE;

  if (!$ftp->ftp_connect($ftp_host)) {
  die("Cannot connect\n");
  }

  if (!$ftp->ftp_login($ftp_user, $ftp_pass)) {
  $ftp->ftp_quit();
  die("Login failed\n");
  }

  if ($pwd = $ftp->ftp_pwd()) {
  echo "Current directory is ".$pwd."\n";
  } else {
  $ftp->ftp_quit();
  die("Error!!\n");
  }

  if ($sys = $ftp->ftp_systype()) {
  echo "Remote system is ".$sys."\n";
  } else {
  $ftp->ftp_quit();
  die("Error!!\n");
  }


  $local_filename  = "local.file";
  $remote_filename = "remote.file";

  if ($ftp->ftp_file_exists($remote_filename) == 1) {
  $ftp->ftp_quit();
  die($remote_filename." already exists\n");
  }

  if ($ftp->ftp_put($remote_filename, $local_filename)) {
  echo $local_filename." has been uploaded as ".$remote_filename."\n";
  } else {
  $ftp->ftp_quit();
  die("Error!!\n");
  }


  $ftp->ftp_quit();
 * ******************************************************************* */



/* * *******************************************************************
  List of available functions

  ftp_connect($server, $port = 21)
  ftp_login($user, $pass)
  ftp_pwd()
  ftp_size($pathname)
  ftp_mdtm($pathname)
  ftp_systype()
  ftp_cdup()
  ftp_chdir($pathname)
  ftp_delete($pathname)
  ftp_rmdir($pathname)
  ftp_mkdir($pathname)
  ftp_file_exists($pathname)
  ftp_rename($from, $to)
  ftp_nlist($arg = "", $pathname = "")
  ftp_rawlist($pathname = "")
  ftp_get($localfile, $remotefile, $mode = 1)
  ftp_put($remotefile, $localfile, $mode = 1)
  ftp_site($command)
  ftp_quit()

 * ******************************************************************* */

class ftp {
    /* Public variables */

    var $debug;
    var $umask;
    var $timeout;

    /* Private variables */
    var $ftp_sock;
    var $ftp_resp;

    /* Constractor */

    function ftp() {
        $this->debug = FALSE;
        $this->umask = 0022;
        $this->timeout = 30;

        if (!defined("FTP_BINARY")) {
            define("FTP_BINARY", 1);
        }
        if (!defined("FTP_ASCII")) {
            define("FTP_ASCII", 0);
        }

        $this->ftp_resp = "";
    }

    /* Public functions */

    function ftp_connect($server, $port = 21) {
        $this->ftp_debug("Trying to " . $server . ":" . $port . " ...\n");
        $this->ftp_sock = @fsockopen($server, $port, $errno, $errstr, $this->timeout);

        if (!$this->ftp_sock || !$this->ftp_ok()) {
            $this->ftp_debug("Error : Cannot connect to remote host \"" . $server . ":" . $port . "\"\n");
            $this->ftp_debug("Error : fsockopen() " . $errstr . " (" . $errno . ")\n");
            return FALSE;
        }
        $this->ftp_debug("Connected to remote host \"" . $server . ":" . $port . "\"\n");

        return TRUE;
    }

    function ftp_login($user, $pass) {
        $this->ftp_putcmd("USER", $user);
        if (!$this->ftp_ok()) {
            $this->ftp_debug("Error : USER command failed\n");
            return FALSE;
        }

        $this->ftp_putcmd("PASS", $pass);
        if (!$this->ftp_ok()) {
            $this->ftp_debug("Error : PASS command failed\n");
            return FALSE;
        }
        $this->ftp_debug("Authentication succeeded\n");

        return TRUE;
    }

    function ftp_pwd() {
        $this->ftp_putcmd("PWD");
        if (!$this->ftp_ok()) {
            $this->ftp_debug("Error : PWD command failed\n");
            return FALSE;
        }

        return preg_replace("/^[0-9]{3} \"(.+)\" .+\r\n/", "\\1", $this->ftp_resp);
    }

    function ftp_size($pathname) {
        $this->ftp_putcmd("SIZE", $pathname);
        if (!$this->ftp_ok()) {
            $this->ftp_debug("Error : SIZE command failed\n");
            return -1;
        }

        return preg_replace("/^[0-9]{3} ([0-9]+)\r\n/", "\\1", $this->ftp_resp);
    }

    function ftp_mdtm($pathname) {
        $this->ftp_putcmd("MDTM", $pathname);
        if (!$this->ftp_ok()) {
            $this->ftp_debug("Error : MDTM command failed\n");
            return -1;
        }
        $mdtm = preg_replace("/^[0-9]{3} ([0-9]+)\r\n/", "\\1", $this->ftp_resp);
        $date = sscanf($mdtm, "%4d%2d%2d%2d%2d%2d");
        $timestamp = mktime($date[3], $date[4], $date[5], $date[1], $date[2], $date[0]);

        return $timestamp;
    }

    function ftp_systype() {
        $this->ftp_putcmd("SYST");
        if (!$this->ftp_ok()) {
            $this->ftp_debug("Error : SYST command failed\n");
            return FALSE;
        }
        $DATA = explode(" ", $this->ftp_resp);

        return $DATA[1];
    }

    function ftp_cdup() {
        $this->ftp_putcmd("CDUP");
        $response = $this->ftp_ok();
        if (!$response) {
            $this->ftp_debug("Error : CDUP command failed\n");
        }
        return $response;
    }

    function ftp_chdir($pathname) {
        $this->ftp_putcmd("CWD", $pathname);
        $response = $this->ftp_ok();
        if (!$response) {
            $this->ftp_debug("Error : CWD command failed\n");
        }
        return $response;
    }

    function ftp_delete($pathname) {
        $this->ftp_putcmd("DELE", $pathname);
        $response = $this->ftp_ok();
        if (!$response) {
            $this->ftp_debug("Error : DELE command failed\n");
        }
        return $response;
    }

    function ftp_rmdir($pathname) {
        $this->ftp_putcmd("RMD", $pathname);
        $response = $this->ftp_ok();
        if (!$response) {
            $this->ftp_debug("Error : RMD command failed\n");
        }
        return $response;
    }

    function ftp_mkdir($pathname) {
        $this->ftp_putcmd("MKD", $pathname);
        $response = $this->ftp_ok();
        if (!$response) {
            $this->ftp_debug("Error : MKD command failed\n");
        }
        return $response;
    }

    function ftp_file_exists($pathname) {
        if (!($remote_list = $this->ftp_nlist("-a"))) {
            $this->ftp_debug("Error : Cannot get remote file list\n");
            return -1;
        }

        reset($remote_list);
        while (list(, $value) = each($remote_list)) {
            if ($value == $pathname) {
                $this->ftp_debug("Remote file " . $pathname . " exists\n");
                return 1;
            }
        }
        $this->ftp_debug("Remote file " . $pathname . " does not exist\n");

        return 0;
    }

    function ftp_rename($from, $to) {
        $this->ftp_putcmd("RNFR", $from);
        if (!$this->ftp_ok()) {
            $this->ftp_debug("Error : RNFR command failed\n");
            return FALSE;
        }
        $this->ftp_putcmd("RNTO", $to);

        $response = $this->ftp_ok();
        if (!$response) {
            $this->ftp_debug("Error : RNTO command failed\n");
        }
        return $response;
    }

    function ftp_nlist($arg = "", $pathname = "") {
        if (!($string = $this->ftp_pasv())) {
            return FALSE;
        }

        if ($arg == "") {
            $nlst = "NLST";
        } else {
            $nlst = "NLST " . $arg;
        }
        $this->ftp_putcmd($nlst, $pathname);

        $sock_data = $this->ftp_open_data_connection($string);
        if (!$sock_data || !$this->ftp_ok()) {
            $this->ftp_debug("Error : Cannot connect to remote host\n");
            $this->ftp_debug("Error : NLST command failed\n");
            return FALSE;
        }
        $this->ftp_debug("Connected to remote host\n");

        while (!feof($sock_data)) {
            $list[] = preg_replace("/[\r\n]/", "", fgets($sock_data, 512));
        }
        $this->ftp_close_data_connection($sock_data);
        $this->ftp_debug(implode("\n", $list));

        if (!$this->ftp_ok()) {
            $this->ftp_debug("Error : NLST command failed\n");
            return FALSE;
        }

        return $list;
    }

    function ftp_rawlist($pathname = "") {
        if (!($string = $this->ftp_pasv())) {
            return FALSE;
        }

        $this->ftp_putcmd("LIST", $pathname);

        $sock_data = $this->ftp_open_data_connection($string);
        if (!$sock_data || !$this->ftp_ok()) {
            $this->ftp_debug("Error : Cannot connect to remote host\n");
            $this->ftp_debug("Error : LIST command failed\n");
            return FALSE;
        }

        $this->ftp_debug("Connected to remote host\n");

        while (!feof($sock_data)) {
            $list[] = preg_replace("/[\r\n]/", "", fgets($sock_data, 512));
        }
        $this->ftp_debug(implode("\n", $list));
        $this->ftp_close_data_connection($sock_data);

        if (!$this->ftp_ok()) {
            $this->ftp_debug("Error : LIST command failed\n");
            return FALSE;
        }

        return $list;
    }

    function ftp_get($localfile, $remotefile, $mode = 1) {
        umask($this->umask);

        if (@file_exists($localfile)) {
            $this->ftp_debug("Warning : local file will be overwritten\n");
        }

        $fp = @fopen($localfile, "w");
        if (!$fp) {
            $this->ftp_debug("Error : Cannot create \"" . $localfile . "\"");
            $this->ftp_debug("Error : GET command failed\n");
            return FALSE;
        }

        if (!$this->ftp_type($mode)) {
            $this->ftp_debug("Error : GET command failed\n");
            return FALSE;
        }

        if (!($string = $this->ftp_pasv())) {
            $this->ftp_debug("Error : GET command failed\n");
            return FALSE;
        }

        $this->ftp_putcmd("RETR", $remotefile);

        $sock_data = $this->ftp_open_data_connection($string);
        if (!$sock_data || !$this->ftp_ok()) {
            $this->ftp_debug("Error : Cannot connect to remote host\n");
            $this->ftp_debug("Error : GET command failed\n");
            return FALSE;
        }
        $this->ftp_debug("Connected to remote host\n");
        $this->ftp_debug("Retrieving remote file \"" . $remotefile . "\" to local file \"" . $localfile . "\"\n");
        while (!feof($sock_data)) {
            fputs($fp, fread($sock_data, 4096));
        }
        fclose($fp);

        $this->ftp_close_data_connection($sock_data);

        $response = $this->ftp_ok();
        if (!$response) {
            $this->ftp_debug("Error : GET command failed\n");
        }
        return $response;
    }

    function ftp_put($remotefile, $localfile, $mode = 1) {

        if (!@file_exists($localfile)) {
            $this->ftp_debug("Error : No such file or directory \"" . $localfile . "\"\n");
            $this->ftp_debug("Error : PUT command failed\n");
            return FALSE;
        }

        $fp = @fopen($localfile, "r");
        if (!$fp) {
            $this->ftp_debug("Error : Cannot read file \"" . $localfile . "\"\n");
            $this->ftp_debug("Error : PUT command failed\n");
            return FALSE;
        }

        if (!$this->ftp_type($mode)) {
            $this->ftp_debug("Error : PUT command failed\n");
            return FALSE;
        }

        if (!($string = $this->ftp_pasv())) {
            $this->ftp_debug("Error : PUT command failed\n");
            return FALSE;
        }

        $this->ftp_putcmd("STOR", $remotefile);

        $sock_data = $this->ftp_open_data_connection($string);
        if (!$sock_data || !$this->ftp_ok()) {
            $this->ftp_debug("Error : Cannot connect to remote host\n");
            $this->ftp_debug("Error : PUT command failed\n");
            return FALSE;
        }
        $this->ftp_debug("Connected to remote host\n");
        $this->ftp_debug("Storing local file \"" . $localfile . "\" to remote file \"" . $remotefile . "\"\n");
        while (!feof($fp)) {
            fputs($sock_data, fread($fp, 4096));
        }
        fclose($fp);

        $this->ftp_close_data_connection($sock_data);

        $response = $this->ftp_ok();
        if (!$response) {
            $this->ftp_debug("Error : PUT command failed\n");
        }
        return $response;
    }

    function ftp_site($command) {
        $this->ftp_putcmd("SITE", $command);
        $response = $this->ftp_ok();
        if (!$response) {
            $this->ftp_debug("Error : SITE command failed\n");
        }
        return $response;
    }

    function ftp_quit() {
        $this->ftp_putcmd("QUIT");
        if (!$this->ftp_ok() || !fclose($this->ftp_sock)) {
            $this->ftp_debug("Error : QUIT command failed\n");
            return FALSE;
        }
        $this->ftp_debug("Disconnected from remote host\n");
        return TRUE;
    }

    /* Private Functions */

    function ftp_type($mode) {
        if ($mode) {
            $type = "I"; //Binary mode
        } else {
            $type = "A"; //ASCII mode
        }
        $this->ftp_putcmd("TYPE", $type);
        $response = $this->ftp_ok();
        if (!$response) {
            $this->ftp_debug("Error : TYPE command failed\n");
        }
        return $response;
    }

    function ftp_port($ip_port) {
        $this->ftp_putcmd("PORT", $ip_port);
        $response = $this->ftp_ok();
        if (!$response) {
            $this->ftp_debug("Error : PORT command failed\n");
        }
        return $response;
    }

    function ftp_pasv() {
        $this->ftp_putcmd("PASV");
        if (!$this->ftp_ok()) {
            $this->ftp_debug("Error : PASV command failed\n");
            return FALSE;
        }

        $ip_port = preg_replace("/^.+ \\(?([0-9]{1,3},[0-9]{1,3},[0-9]{1,3},[0-9]{1,3},[0-9]+,[0-9]+)\\)?.*\r\n$/", "\\1", $this->ftp_resp);
        return $ip_port;
    }

    function ftp_putcmd($cmd, $arg = "") {
        if ($arg != "") {
            $cmd = $cmd . " " . $arg;
        }

        fputs($this->ftp_sock, $cmd . "\r\n");
        $this->ftp_debug("> " . $cmd . "\n");

        return TRUE;
    }

    function ftp_ok() {
        $this->ftp_resp = "";
        do {
            $res = fgets($this->ftp_sock, 512);
            $this->ftp_resp .= $res;
        } while (substr($res, 3, 1) != " ");

        $this->ftp_debug(str_replace("\r\n", "\n", $this->ftp_resp));

        if (!preg_match("/^[123]/", $this->ftp_resp)) {
            return FALSE;
        }

        return TRUE;
    }

    function ftp_close_data_connection($sock) {
        $this->ftp_debug("Disconnected from remote host\n");
        return fclose($sock);
    }

    function ftp_open_data_connection($ip_port) {
        if (!preg_match("/[0-9]{1,3},[0-9]{1,3},[0-9]{1,3},[0-9]{1,3},[0-9]+,[0-9]+/", $ip_port)) {
            $this->ftp_debug("Error : Illegal ip-port format(" . $ip_port . ")\n");
            return FALSE;
        }

        $DATA = explode(",", $ip_port);
        $ipaddr = $DATA[0] . "." . $DATA[1] . "." . $DATA[2] . "." . $DATA[3];
        $port = $DATA[4] * 256 + $DATA[5];
        $this->ftp_debug("Trying to " . $ipaddr . ":" . $port . " ...\n");
        $data_connection = @fsockopen($ipaddr, $port, $errno, $errstr);
        if (!$data_connection) {
            $this->ftp_debug("Error : Cannot open data connection to " . $ipaddr . ":" . $port . "\n");
            $this->ftp_debug("Error : " . $errstr . " (" . $errno . ")\n");
            return FALSE;
        }

        return $data_connection;
    }

    function ftp_debug($message = "") {
        if ($this->debug) {
            echo $message,'<br />';
        }

        return TRUE;
    }

}

?>