$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";
 }

<?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['host'], $this->config['port']);
 if( ssh2_auth_password($this->conn, $this->config['username'], $this->config['password']))
 {
  
 }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); 
 
 }
 
}