JIT (False Interpreter for PHP)

The just-in-time (JIT) compiler in PHP is an important feature introduced in PHP 8. It aims to improve the performance of PHP applications by compiling pieces of code into machine code at execution time, instead of compiling them every time it is executed. Here's a detailed look at the JIT compiler and how it benefits PHP:

What is a JIT compiler?
A just-in-time (JIT) compiler is a component that improves the speed of program execution. Unlike traditional interpreters, which execute code line by line, a JIT compiler translates parts of the code into machine language immediately before execution. This automated compiled code runs much faster because it is executed directly by the CPU.

How does the JIT compiler work in PHP
Cache: Before PHP 8, PHP code was compiled into Opcodes, which were then executed by the Zend Engine. Opcache stores these Opcodes to speed up execution by avoiding recompilation.

JIT Compilation: With PHP 8, JIT compiles these temporary code into machine code at runtime. This machine code is then stored and executed directly by the central processing unit (CPU), which can significantly speed up performance for certain types of operations.

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