The underlying development principles of PHP7 are broad and profound: learn the core knowledge points of the PHP kernel

The underlying development principles of PHP7 are broad and profound: learn the core knowledge points of the PHP kernel

Introduction:
PHP is an open source programming language widely used in the field of Web development , which has the characteristics of being easy to learn, flexible, and rapid development, and has been loved and sought after by many developers. However, in addition to being proficient in PHP syntax and basic Web development skills at the application level, understanding the underlying development principles of PHP and learning PHP kernel knowledge are of great significance for understanding the operating mechanism of PHP and optimizing program performance. This article will introduce the core knowledge points of the underlying development principles of PHP7 and help readers gain an in-depth understanding of PHP's internal working methods and implementation mechanisms.

1. Zend engine:
The Zend engine is the core component of PHP and is responsible for parsing and executing PHP code. The core of Zend engine is lexical analyzer, syntax analyzer, compiler and execution engine. It converts PHP code into intermediate code, and then converts the intermediate code into machine code through the execution engine, and finally executes the program.

2. PHP’s memory management:
PHP’s memory management is a very important part of the underlying development of PHP7. PHP uses an automatic memory management mechanism, which manages memory allocation and recycling through the garbage collector (GC). The garbage collector is responsible for detecting memory that is no longer in use and releasing it, thereby improving memory utilization. Understanding PHP's memory management mechanism can help optimize code performance and avoid problems such as memory leaks and memory overflows.

3. PHP extension mechanism:
PHP’s extension mechanism is one of the keys to realizing the underlying development of PHP. PHP provides a rich extension interface, allowing developers to build their own extension modules on top of the PHP core. Through the extension mechanism, functionally complex C or C code can be integrated into PHP to provide more powerful functions and performance. Understanding PHP's extension mechanism plays an important role in customized development and improving program performance.

4. PHP performance optimization:
PHP performance optimization is one of the important issues that developers need to pay attention to in the underlying development of PHP. Through reasonable optimization techniques, the execution efficiency and response speed of PHP programs can be improved. Common performance optimization methods include caching technology, code optimization, database optimization, concurrency control, etc. In actual development, developers can also use some performance analysis tools to detect and tune programs to improve user experience.

5. PHP security:
PHP security is an issue that developers need to pay special attention to in the underlying development of PHP. Due to the flexibility and ease of use of PHP, it is easy to overlook some security risks during the coding process, causing the program to be hacked. In order to ensure the security of the program, developers need to pay attention to some common security issues, such as SQL injection, cross-site scripting attacks (XSS), cross-site request forgery (CSRF), etc. At the same time, it is also very important to update the PHP version in a timely manner, use safe configuration options, and strengthen server security.

Conclusion:
The underlying development principles of PHP7 involve many knowledge points and technical details, which are difficult to fully cover in just one article. However, by understanding core knowledge points such as Zend engine, PHP's memory management, extension mechanism, performance optimization and security, developers can open a door to the underlying development of PHP. In-depth study and mastery of PHP's underlying development principles will help developers better understand PHP's operating mechanism, optimize program performance, improve system stability and security, and thus better cope with complex web development challenges.

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