Detailed explanation of examples of uploading and downloading functions using PHP SFTP

This article will first introduce you to SFTP. Later, we will mainly share with you examples of how SFTP implements upload and download functions. We hope it can help you.

1. Introduction to SFTP:

The protocol that uses the SSH protocol for FTP transmission is called SFTP (Secure File Transfer). Sftp and Ftp are both file transfer protocols. Difference: sftp is a protocol included in ssh (ssh is an encrypted telnet protocol). As long as the sshd server is started, it is available. Moreover, sftp is more secure and does not require the ftp server to be started. sftp = ssh + ftp (Secure File Transfer Protocol). Since ftp transmits plain text, there is no security, while sftp is based on ssh, and the transmission content is encrypted, which is more secure. The current network is not very secure. Those who used telnet in the past have switched to ssh2 (SSH1 has been cracked).

The sftp tool is used the same as ftp. However, its transmitted files are encrypted through SSL and cannot be cracked even if they are intercepted. Moreover, sftp has more functions than ftp, including some additional file attribute settings.

2. SSH2 extension configuration

1. Download address: http://windows.php.net/downloads/pecl/releases/ ssh2/0.12/

Choose the expansion package according to your php version. Here I am using php5.3, so I downloaded php_ssh2-0.12-5.3-ts-vc9-x86.zip ( Download link)

#2. After decompression, there will be three files, libssh2.dll, php_ssh.dll, php_ssh2.pdb.

3. Place php_ssh.dll and php_ssh2.pdb under your php extension directory php/ext/.

4. Copy libssh2.dll to c:/windows/system32 and c:/windows/syswow64

5. Add it to php.ini extension=php_ssh2.dll

6. Restart Apache and print phpinfo(); The SSH2 extension will appear, indicating that the installation is successful

3. SFTP code DEMO

Calling code

 $config = array(
  'host' =>'211.*.*.*', //服务器
  'port' => '23', //端口
  'username' =>'test', //用户名
  'password' =>'*****', //密码
 );
 $ftp = new Sftp($config);
 $localpath="E:/www/new_20170724.csv";
 $serverpath='/new_20170724.csv';
 $st = $ftp->upftp($localpath,$serverpath); //上传指定文件
 if($st == true){
  echo "success";
  
 }else{
  echo "fail";
 }

SFTP encapsulation class

<?php
/**
 * SFtp上传下载文件
 *
 */
namespace Common\ORG\Util;

class Sftp
{
 
 // 初始配置为NULL
 private $config = NULL;
 // 连接为NULL
 private $conn = NULL;
 // 初始化
 public function __construct($config)
 {
 $this->config = $config;
 $this->connect();
 }
 

 public function connect()
 {
 
 $this->conn = ssh2_connect($this->config[&#39;host&#39;], $this->config[&#39;port&#39;]);
 if( ssh2_auth_password($this->conn, $this->config[&#39;username&#39;], $this->config[&#39;password&#39;]))
 {
  
 }else{ 
  echo "无法在服务器进行身份验证";
 }
 
 }
 
 // 传输数据 传输层协议,获得数据
 public function downftp($remote, $local)
 { 
 $ressftp = ssh2_sftp($this->conn);
 return copy("ssh2.sftp://{$ressftp}".$remote, $local);
 }
 
 // 传输数据 传输层协议,写入ftp服务器数据
 public function upftp( $local,$remote, $file_mode = 0777)
 { 
 $ressftp = ssh2_sftp($this->conn);
 return copy($local,"ssh2.sftp://{$ressftp}".$remote); 
 
 }
 
}

Related recommendations:

How to implement sftp in php

Detailed explanation of the steps to use SFTP in Phpstorm

Use nodejs to monitor file changes and use sftp to upload to the server

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