Why does php8 have high performance?

The reason for the high performance of php8: php8 introduces a JIT compiler, optimizes function calls, array operations, introduces new data structures and algorithms, and repairs and optimizes some internal implementation details, etc. Detailed introduction: 1. The Just-In-Time (JIT) compiler is introduced. The JIT compiler is a dynamic compilation technology that converts PHP code into machine code for more efficient execution; 2. Optimizes function calls. In PHP8, by introducing the inline caching (IC) mechanism of function calls, expensive overhead and so on can be avoided.

Operating system for this tutorial: Windows 10 system, PHP8 version, Dell G3 computer.

PHP is a widely used server-side scripting language for developing web applications. PHP continues to evolve and improve over time, and PHP 8, the latest version, brings many exciting new features and performance improvements. This article will explore why PHP 8 has excellent performance and list some reasons for the performance improvement.

First of all, PHP 8 introduces the Just-In-Time (JIT) compiler. The JIT compiler is a dynamic compilation technology that converts PHP code into machine code for more efficient execution. The traditional PHP interpreter interprets and executes the code line by line, while the JIT compiler can compile the hot code into machine code at runtime, thus improving the execution speed. This means that PHP 8 can be several times faster than previous versions in some cases.

Secondly, PHP 8 optimizes function calls. In previous versions, function calling was a relatively expensive operation because it involved stack manipulation and parameter passing. However, in PHP 8, these overheads can be avoided by introducing the inline caching (IC) mechanism of function calls. The IC mechanism caches the internal information of the function when it is called for the first time so that it can be used directly in subsequent calls, thus improving the performance of function calls.

In addition, PHP 8 also optimizes array operations. In previous versions, array operations such as traversal, access, and modification could result in high memory and CPU overhead. However, in PHP 8, the overhead of array operations can be reduced by introducing a technique called "ZVAL copying". ZVAL copy is a delayed copy mechanism that only copies the array when it needs to be modified, thereby reducing unnecessary memory and CPU overhead.

In addition, PHP 8 also improves performance by introducing new data structures and algorithms. For example, PHP 8 introduced a data structure called a "red-black tree" for implementing ordered collections. The red-black tree is a self-balancing binary search tree that can perform insertion, deletion and search operations in O(log n) time, thereby improving the performance of ordered sets.

Finally, PHP 8 also improves performance by fixing and optimizing some internal implementation details. For example, PHP 8 fixes some memory leaks and resource leaks, thereby reducing memory usage. In addition, PHP 8 also improves the garbage collection mechanism to improve the efficiency of memory management.

To sum up, the reason why PHP 8 has excellent performance is because it introduces a JIT compiler, optimizes function calls and array operations, introduces new data structures and algorithms, and fixes and optimizes Some internal implementation details. These improvements have made PHP 8 significantly improved in terms of execution speed and memory management, allowing developers to develop and deploy web applications more efficiently.

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