What is the professional knowledge of PHP?

php professional knowledge includes syntax and basic knowledge, web development related knowledge, database operations, security, caching and performance optimization, object-oriented programming, API development, testing and debugging, frameworks and extensions and learning and continuous development wait. Detailed introduction: 1. Basic syntax and language structure, including basic syntax such as variables, data types, operators, conditional statements, loop statements, etc. You also need to understand PHP's built-in functions and array operations; 2. Web development-related technologies, including HTML , CSS, JavaScript, HTTP protocol, etc.

The operating environment of this article: Windows 10 system, PHP8.1.3 version, Dell G3 computer.

PHP (Hypertext Preprocessor) is a widely used open source server-side scripting language, especially suitable for web development. As a programmer, it is very important to understand and master the professional knowledge of PHP. Following are some important aspects regarding PHP expertise.

Grammar and basic knowledge:

Understanding the basic syntax and language structure of PHP is the first step. Including variables, data types, operators, conditional statements, loop statements and other basic syntax. You also need to understand PHP's built-in functions and array operations.

Knowledge related to Web development:

The main application area of ​​PHP is Web development, so you need to be familiar with Web development-related technologies. Including HTML, CSS, JavaScript, HTTP protocol, form processing, session management, etc. Understanding common web development frameworks, such as Laravel, Symfony, CodeIgniter, etc., can improve development efficiency.

Database operation:

PHP often interacts with the database, so it is necessary to understand the knowledge related to database operation. Master the SQL language, understand the basic concepts and design principles of databases, and be able to use database extensions provided by PHP (such as MySQLi, PDO) for database connection, query and update operations.

Security:

Security is an important issue in Web development. Understand common web security vulnerabilities, such as cross-site scripting attacks (XSS), SQL injection, cross-site request forgery (CSRF), etc., and understand the corresponding defensive measures. Master password storage and encryption methods to protect the security of user data.

Caching and performance optimization:

For high-performance web applications, caching and performance optimization are essential. Understand the concepts and principles of caching, and master common caching technologies, such as page caching, database query caching, object caching, etc. At the same time, you need to understand performance optimization methods, such as code optimization, database query optimization, resource compression, etc., to improve the response speed and throughput of the application.

Object-oriented programming (OOP):

PHP supports object-oriented programming, masters the basic concepts and principles of OOP, and can use concepts such as classes, objects, inheritance, encapsulation, and polymorphism for program design . Understand design patterns, such as singleton pattern, factory pattern, observer pattern, etc., and be able to apply them in actual development.

API development:

With the rise of mobile applications, API development has become more and more important. Understand the design principles and specifications of RESTful APIs, be able to use PHP to develop and publish APIs, and master the writing and management of API documents.

Testing and debugging:

Good testing and debugging skills are essential skills for a good programmer. Understand common testing methods and tools, such as unit testing, integration testing, functional testing, etc. Master debugging technology and be able to use breakpoint debugging, logging, etc. to locate and solve problems.

Frameworks and extensions:

PHP has many excellent frameworks and extensions, such as Symfony, Laravel, CodeIgniter, etc. Understand the use and principles of these frameworks and extensions, and be able to quickly build and maintain complex web applications.

Learning and continuous development:

As a programmer, continuous learning and development are very important. Understand the latest PHP versions and features, participate in discussions and contributions in the open source community, read relevant technical books and blogs, and participate in technical exchange activities to continuously improve your technical level and professional competitiveness.

To sum up, as a programmer, it is very important to master the professional knowledge of PHP. In addition to basic syntax and language structures, you also need to understand web development, database operations, security, caching and performance optimization, object-oriented programming, API development, testing and debugging, frameworks and extensions, etc. At the same time, only by continuing to learn and develop, and maintaining attention and learning about the latest technologies, can we continuously improve our technical level.

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