Comprehensive analysis of the underlying development principles of PHP7: learn the architecture and evolution of the PHP kernel

Comprehensive analysis of the underlying development principles of PHP7: Learn the architecture and evolution of the PHP kernel

PHP is a scripting language widely used in the field of Web development. It is convenient and flexible. Its features make it a common choice among developers. As the latest version of the PHP language, PHP7 has been greatly improved in terms of performance and user experience. To understand the underlying development principles of PHP7, we need to start with its architecture and evolution.

First of all, to understand the underlying development principles of PHP7, you must understand the architecture of the PHP kernel. The PHP core is mainly composed of three components: Zend engine, extensions and language core. Zend engine is the core component of PHP and is responsible for interpreting and executing PHP code. It converts PHP code into bytecode and then executes it through the interpreter. Extensions are plug-ins written to enhance PHP functions and can implement functions such as database connection, image processing, etc. The PHP language core includes the PHP compiler and standard library to handle language-level functionality.

The underlying development principles of PHP7 are different from previous versions. PHP7 uses the new Zend engine-Zend Engine 3.0. Zend Engine 3.0 has significantly improved performance compared to previous versions, mainly by optimizing the memory layout and improving the bytecode execution engine. In addition, it also introduces a Just-in-Time (JIT) compiler, which can compile bytecode into local machine code on the fly to improve execution speed.

Another key part of PHP7’s underlying development principles is memory management. PHP manages memory through reference counters. When a variable's reference count is reduced to zero, that is, when no other variables refer to it, the memory will be released. However, reference counters pose some performance issues because each time a variable reference is modified, the reference counter needs to be updated. To solve this problem, PHP7 introduces a new garbage collector - reference counter mark cleaner. The garbage collector can automatically recycle unreferenced variables, improving the efficiency of memory management.

The evolution of the PHP kernel is also an important part of understanding the underlying development principles of PHP7. PHP was originally developed by Rasmus Lerdorf to handle logs for personal websites. Over time, PHP grew into a scripting language and gained widespread support in the open source community. During its evolution, PHP has gone through many version updates, constantly improving its performance and stability. As an important milestone, PHP7 has made huge progress in improving performance and introducing new features.

To sum up, a comprehensive analysis of the underlying development principles of PHP7 includes an understanding of the PHP kernel architecture and a review of its evolution. By studying the working principles and improvements of the PHP kernel, we can better understand the performance improvements and new features of PHP7. An in-depth understanding of the underlying development principles will help us optimize the performance of PHP applications and better utilize the powerful features of PHP. I hope this article will help readers understand the underlying development principles of PHP7.

The above is the detailed content of Comprehensive analysis of the underlying development principles of PHP7: learn the architecture and evolution of the PHP kernel. For more information, please follow other related articles on the PHP Chinese website!