Core knowledge points of PHP7 underlying development principles: learn key concepts and technologies of PHP kernel

Core knowledge points of the underlying development principles of PHP7: Learning the key concepts and technologies of the PHP kernel

Introduction:
In today's Internet era, PHP has become the most popular One of the most popular server-side scripting languages. The popularity of PHP has made the development of web applications easier and more efficient. However, as a developer, if you want to understand PHP more deeply and improve your skill level, then it is particularly important to learn the underlying development principles of PHP. PHP7 is the latest milestone version, which is of great significance for understanding and learning the key concepts and technologies of the PHP kernel.

1. Overview of the underlying principles of PHP7
PHP7 is a version developed based on Zend Engine 3.0, which is the core engine of PHP. The underlying development principle mainly involves how to convert PHP code into executable instructions, which are then interpreted and executed by the Zend engine. Learning the underlying development principles of PHP7 will give you a deeper understanding of PHP's operating mechanism.

2. Key concepts of PHP kernel
1. Variables and their underlying implementation
In PHP, variables are a very important concept. Understanding the underlying implementation principles of variables is the basis for learning the PHP kernel. In PHP7, the underlying implementation of variables introduces the Zval structure, which stores the value and type information of the variable.

2. Garbage collection mechanism
PHP7 introduces a new Garbage Collection (GC) mechanism, which replaces the reference counting technology in previous versions. The GC mechanism can more effectively reclaim useless memory and improve program performance and stability.

3. Execution flow control
Understanding PHP’s execution flow control is the key to learning the PHP kernel. Mastering how to implement basic control processes such as conditional statements, loop statements, and function calls is crucial to understanding the inner workings of PHP.

3. Key technologies of PHP kernel
1.OPCache
OPCache is a technology provided by the PHP7 kernel that compiles PHP scripts into bytecode and caches them. Using OPCache can significantly improve the performance of PHP applications.

2. Extension mechanism
The PHP kernel also provides a rich extension mechanism, allowing developers to extend functions according to their own needs. By learning the extension mechanism, developers can better understand the design and implementation of the PHP kernel.

3. Error handling mechanism
   The PHP kernel also provides a flexible error handling mechanism that can capture and handle various error situations to ensure the robustness and reliability of the program.

4. Suggestions for learning the underlying development principles of PHP7
1. Read the source code
The best way to learn the underlying development principles of PHP7 is to read the PHP source code. By carefully reading the PHP source code, you can better understand the underlying implementation principles, and understand the developers' ideas and designs when implementing functions.

2. References and open source projects
In addition to reading the source code, referring to relevant literature and open source projects is also an important way to learn the underlying development principles of PHP. These resources can help developers learn the design and implementation ideas of the PHP kernel more systematically.

3. Practice
Theoretical study is only the starting point, and it is also very important to consolidate the knowledge learned through practice. You can apply the underlying development principles you learned by writing PHP extensions, optimizing performance, etc.

Conclusion:
Learning the core knowledge points of the underlying development principles of PHP7 is of great significance to improving your skill level and in-depth understanding of the operating mechanism of PHP. By understanding the key concepts and technologies of the PHP kernel, developers can better optimize and expand PHP applications and improve program performance and stability. Therefore, it is well worth investing time and energy to learn the underlying development principles of PHP.

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