What knowledge should you focus on learning in PHP?

php should focus on learning basic knowledge, database operations, web development, security and performance optimization, etc. Detailed introduction: 1. Basic knowledge, learn about syntax and semantics, functions and classes, and file operations; 2. Database operations, learn about SQL statements and database connections and operations; 3. Web development, learn about HTTP protocol and front-end Technical and other aspects of knowledge; 4. Security and performance optimization, learn PHP security and performance optimization and other aspects of knowledge.

The operating system for this tutorial: Windows 10 system, PHP8.1.3 version, Dell G3 computer.

PHP (Hypertext Preprocessor) is a scripting language widely used in Web development. Its ease of learning and powerful functions make it the first choice of many developers. However, to become a good PHP developer, you need to master some important knowledge and skills. This article will introduce several aspects that should be focused on learning in PHP, as well as the important knowledge points.

1. Basic knowledge

1. Syntax and semantics: It is very important to learn the basic syntax and semantics of PHP, including variables, data types, operators, conditional statements, loop statements, etc. . Mastering these basics is the foundation for understanding and writing PHP code.

2. Functions and classes: PHP provides many built-in functions and classes. Learning their usage and functions can improve development efficiency. At the same time, it is also essential to understand how to customize functions and classes and how to use them to organize and reuse code.

3. File operation: In actual development, it is often necessary to read and write files. Learn the file operation functions in PHP, such as opening, closing, reading and writing files, etc., to better handle file-related tasks.

2. Database operation

1. SQL statements: The interaction between PHP and database is very common, and learning SQL statements is essential. Understanding how to create, query, update, and delete data in a database, as well as how to use advanced techniques such as indexes and related tables, can improve the efficiency and accuracy of database operations.

2. Database connection and operation: Learning how to connect to the database, execute SQL statements, process query results, etc. is the basis for database operations. At the same time, understanding how to use advanced technologies such as prepared statements and transaction processing can improve the security and performance of your database.

3. Web Development

1. HTTP protocol: Understanding the basic principles of the HTTP protocol and commonly used request and response headers is very important for developing Web applications. Mastering the HTTP protocol can better understand and process web requests and responses, as well as handle user state information such as cookies and sessions.

2. Front-end technology: As a PHP developer, understanding front-end technology is essential. Learning front-end technologies such as HTML, CSS, and JavaScript allows you to better collaborate with front-end developers to achieve better user interfaces and user experiences.

4. Security and performance optimization

1. Security: Learn how to write secure PHP code to prevent common security vulnerabilities such as SQL injection and cross-site scripting attacks. Understanding how to filter user input, use prepared statements, validate and filter data, and more can improve the security of your application.

2. Performance optimization: Performance optimization of PHP applications is an important topic. Learn how to optimize database queries, use caching, reduce network requests, and more to improve your application's responsiveness and concurrency.

Conclusion:

PHP is a scripting language widely used in Web development. Mastering its basic knowledge, database operations, Web development technology, security and performance optimization is the The foundation of becoming a good PHP developer. Through continuous learning and practice, and continuous improvement of your skills and abilities, you can achieve better results in the field of PHP development.

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