Sftp usage tutorial in php
<!--?php /** php 中的sftp 使用教程 Telnet、FTP、SSH、SFTP、SSL (一) ftp 协议简介 FTP(File Transfer Protocol,文件传输协议)是互联网上常用的协议之一,人们用FTP实现互连网上的文件传输。 如同其他的很多通讯协议,FTP通讯协议也采用客户机 / 服务器(Client / Server )架构。用户可以通过各种不同的FTP客户端程序, 借助FTP协议,来连接FTP服务器,以上传或者下载文件FTP的命令传输和数据传输是通过不同的端口进行传输的 FTP是TCP/IP的一种具体应用,它工作在OSI模型的第七层,TCP模型的第四层上,即应用层,使用TCP传输而不是UDP, 这样FTP客户在和服 务器建立连接前就要经过一个被广为熟知的三次握手的过程,它带来的意义在于客户与服务器之间的连接是可靠的, 而且是面向连接,为数据的传输提供了可靠 的保证。 (二)ssh协议 ssh 的全称为 SecureShell ,可以报所有的传输数据惊醒加密,这样'中间人'就不能获得我们传输的数据 同事,传输的数据是经过压缩的,可以加快传输的速度.ssh有很多功能,可以替代telnet 也可也为ftppop ,提供一个安全的通道 SSH协议框架中最主要的部分是三个协议: * 传输层协议(The Transport Layer Protocol)提供服务器认证,数据机密性,信息完整性 等的支持; * 用户认证协议(The User Authentication Protocol) 则为服务器提供客户端的身份鉴别; * 连接协议(The Connection Protocol) 将加密的信息隧道复用成若干个逻辑通道,提供给更高层的应用协议使用; 各种高层应用协议可以相对地独立于SSH基本体系之外,并依靠这个基本框架,通过连接协议使用SSH的安全机制。 (三)sftp 协议 使用SSH协议进行FTP传输的协议叫SFTP(安全文件传输)Sftp和Ftp都是文件传输协议。区别:sftp是ssh内含的协议(ssh是加密的telnet协议), 只要sshd服务器启动了,它就可用,而且sftp安全性较高,它本身不需要ftp服务器启动。 sftp = ssh + ftp(安全文件传输协议)。由于ftp是明文传输的, 没有安全性,而sftp基于ssh,传输内容是加密过的,较为安全。目前网络不太安全,以前用telnet的都改用ssh2(SSH1已被破解)。sftp这个工具和ftp用 法一样。但是它的传输文件是通过ssl加密了的,即使被截获了也无法破解。而且sftp相比ftp功能要多一些,多了一些文件属性的设置 */ // 注意这里只是为了介绍ftp ,并没有做验证 ; class ftp{ // 初始配置为NULL private $config =NULL ; // 连接为NULL private $conn = NULL; public function init($config){ $this--->config = $config; } // ftp 连接 public function connect(){ return $this->conn = ftp_connect($this->config['host'],$this->config['port'])); } // 传输数据 传输层协议,获得数据 true or false public function download($remote, $local,$mode = 'auto'){ return $result = @ftp_get($this->conn, $localpath, $remotepath, $mode); } // 传输数据 传输层协议,上传数据 true or false public function upload($remote, $local,$mode = 'auto'){ return $result = @ftp_put($this->conn, $localpath, $remotepath, $mode); } // 删除文件 public function remove($remote){ return $result = @ftp_delete($this->conn_id, $file); } } // 使用 $config = array( 'hostname' => 'localhost', 'username' => 'root', 'password' => 'root', 'port' => 21 ) ; $ftp = new Ftp(); $ftp->connect($config); $ftp->upload('ftp_err.log','ftp_upload.log'); $ftp->download('ftp_upload.log','ftp_download.log'); /*根据上面的三个协议写出基于ssh 的ftp 类 我们知道进行身份认证的方式有两种:公钥;密码 ; (1) 使用密码登陆 (2) 免密码登陆也就是使用公钥登陆 */ class sftp{ // 初始配置为NULL private $config =NULL ; // 连接为NULL private $conn = NULL; // 是否使用秘钥登陆 private $use_pubkey_file= false; // 初始化 public function init($config){ $this->config = $config ; } // 连接ssh ,连接有两种方式(1) 使用密码 // (2) 使用秘钥 public function connect(){ $methods['hostkey'] = $use_pubkey_file ? 'ssh-rsa' : [] ; $con = ssh2_connect($this->config['host'], $this->config['port'], $methods); //(1) 使用秘钥的时候 if($use_pubkey_file){ // 用户认证协议 $rc = ssh2_auth_pubkey_file( $conn, $this->config['user'], $this->config['pubkey_file'], $this->config['privkey_file'], $this->config['passphrase']) ); //(2) 使用登陆用户名字和登陆密码 }else{ $rc = ssh2_auth_password( $conn, $this->conf_['user'],$this->conf_['passwd']); } return $rc ; } // 传输数据 传输层协议,获得数据 public function download($remote, $local){ return ssh2_scp_recv($this->conn_, $remote, $local); } //传输数据 传输层协议,写入ftp服务器数据 public function upload($remote, $local,$file_mode=0664){ return ssh2_scp_send($this->conn_, $local, $remote, $file_mode); } // 删除文件 public function remove($remote){ $sftp = ssh2_sftp($this->conn_); $rc = false; if (is_dir(ssh2.sftp://{$sftp}/{$remote})) { $rc = false ; // ssh 删除文件夹 $rc = ssh2_sftp_rmdir($sftp, $remote); } else { // 删除文件 $rc = ssh2_sftp_unlink($sftp, $remote); } return $rc; } } $config = [ host => 192.168.1.1 , // ftp地址 user => ***, port => 22, pubkey_path => /root/.ssh/id_rsa.pub, // 公钥的存储地址 privkey_path => /root/.ssh/id_rsa, // 私钥的存储地址 ]; $handle = new SftpAccess(); $handle->init($config); $rc = $handle->connect(); $handle->getData(remote, $local); /*

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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