SSH connection library in PHP8.0: phpseclib

Editor's Foreword: This article mainly introduces the SSH connection library phpseclib in PHP8.0, aiming to help PHP developers understand and apply this tool more deeply.

With the continuous development of Internet technology, remote operation of servers has become a problem that more and more developers must face. Among them, SSH connection is a very common remote server connection method. In PHP, we can use the phpseclib tool to implement SSH connections.

Below, I will introduce you to the basic usage of phpseclib and related precautions.

1. Download phpseclib

First, we need to download phpseclib. Visit the GitHub page of the phpseclib project, click the "Clone or download" button, and select "Download ZIP" to download the compressed package.

2. Install phpseclib

After the download is completed, unzip the compressed package to the vendor directory of the project. The decompressed directory structure is as follows:

vendor/
└── phpseclib
    ├── autoload.php
    ├── build.xml
    ├── composer.json
    ├── docs
    ├── phpseclib
    └── tests

3. Use phpseclib for SSH connection

Before using phpseclib to connect to the remote server, we need to know which parameters need to be provided. Generally speaking, the following parameters need to be provided:

• IP address: the IP address of the remote server, for example: 192.168.1.100
• SSH port number: the port used for SSH connection to the remote server Number, the default is 22
• Username: the username used to connect to the remote server via SSH
• Password: the password used to connect to the remote server through SSH

Yes With these parameters, we can use phpseclib to connect to the remote server. The following is a simple example code for using phpseclib to connect to a remote server:

use phpseclibNetSSH2;

$ssh = new SSH2('192.168.1.100', 22);
if (!$ssh->login('username', 'password')) {
    exit('Login Failed');
}
echo $ssh->exec('ls -la');

Code analysis:

• The first line uses the use keyword to introduce the phpseclibNetSSH2 class
• The second line creates an instance of SSH2. The first parameter is the IP address of the remote server. The second parameter is the port number of the SSH connection. The default is 22
• . The third line performs login verification. The first parameter is is the user name of the remote server, parameter two is the password of the remote server
• The fourth line executes the ls -la command on the remote server and outputs the result

In addition, in the actual During use, we also need to pay attention to the following points:

• When connecting to the remote server, you need to ensure that the remote server has enabled the SSH service
• When connecting to the remote server, you need to ensure that the local server has the ability to connect to the remote server Permission to send SSH requests
• When connecting to a remote server, you need to ensure that the remote server has opened the corresponding SSH port

Summary:

phpseclib is a powerful SSH connection Library, which can be used in PHP programs to connect to remote servers. Through the introduction of this article, I believe that everyone has mastered the basic usage and precautions of phpseclib, and I hope that you can use it flexibly in future projects.

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