Beginner's Guide to PHP: Computer Networking

Computer network is one of the basic knowledge necessary to master Internet technology today. PHP, as a scripting language commonly used for website development, also requires an in-depth understanding of network knowledge. This article will take you step by step to understand the basic knowledge of computer networks and the application of PHP.

1. Basic knowledge of computer network

1. The concept of network

Computer network refers to connecting multiple computers to each other, communicating with each other, and sharing resources a technology. The network can be a local area network or a wide area network, and can be connected by wired or wireless connections.

2. Network topology

The network topology refers to the connection method between devices. Common topologies include star, bus, ring, tree, etc.

3. Network Protocol

Network protocols are rules for communication between computers. Common protocols include TCP/IP protocol, HTTP protocol, etc. Different protocols have different functions. For example, the TCP/IP protocol is used for the transport layer of the network, and the HTTP protocol is used for the application layer of the network.

4. IP address

The IP address is the unique identifier of the computer on the network. IP addresses can be divided into two types: IPv4 and IPv6, among which IPv4 is the currently widely used IP address format. IP addresses are usually represented as xxx.xxx.xxx.xxx, where each x is a number from 0 to 255.

5. Domain name

A domain name is the name used by people when visiting a website on the Internet. It actually points to an IP address. For example, when you enter "www.baidu.com" in the browser, you are actually accessing the IP address corresponding to the domain name.

2. Network applications in PHP

1. Network functions of PHP

PHP provides a wealth of network functions that can be used to implement network communications, network Data transmission and other functions. Common network functions include fsockopen, feof, fread, fputs, etc. These functions can be used to implement data transfer between the client and the server, as well as read and write operations on network files.

2. PHP’s network framework

PHP also has its own network framework, such as Laravel, Zend, etc. These frameworks provide encapsulated network modules, making it easier for developers to develop network applications.

3. PHP and HTTP protocol

HTTP protocol is one of the application layer protocols based on TCP/IP protocol. PHP supports the HTTP protocol to enable the development of web applications. Variables such as $_GET and $_POST in PHP can be used to obtain parameters in HTTP requests and process them.

4. PHP and data communication

In addition to the HTTP protocol, PHP can also communicate data through other network protocols. For example, the SMTP protocol can be used to send emails, which can be implemented in PHP through the email sending function.

5. PHP and data transmission

In addition to the above network functions, PHP also supports FTP protocol, SSH protocol, etc., which can be used for file transfer, remote login and other functions accomplish.

3. Conclusion

The above is a brief introduction to the basic knowledge of computer networks and network applications in PHP. As a PHP developer, if you have an in-depth understanding of the basic knowledge of computer networks and master the development technology of network applications, you can better use PHP to develop web applications and meet different network needs.

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