Optimization analysis of the underlying development principles of PHP7: Discussing the working principle of the PHP optimizer

Optimization analysis of the underlying development principles of PHP7: Discussing the working principle of the PHP optimizer

Abstract:
With the rapid development of network technology, PHP as a Commonly used server-side scripting languages ​​are also constantly being improved and optimized. The PHP7 version has made major improvements and optimizations in the underlying development principles, especially the working principle of the optimizer, which has significantly improved PHP's execution speed and performance. This article will focus on the working principle of the PHP7 optimizer and demonstrate it through code examples.

1. Preface
   The PHP optimizer is an important component in the PHP interpreter. Its main function is to perform a series of optimization and optimization operations on the code before interpreting and executing the PHP code. Improve code execution efficiency and performance. In PHP7, the optimizer has made a series of improvements and optimizations on the underlying development principles, resulting in significant improvements in performance of PHP7.
2. The working principle of the PHP7 optimizer
   The PHP7 optimizer mainly includes the following working principles:

2.1 Abstract syntax tree
PHP code is interpreted before execution , it will first be analyzed and converted into an Abstract Syntax Tree (AST). Abstract syntax tree is a tree-structured data representation that can clearly show the hierarchical structure and logical relationship of the code.

2.2 Code Optimization
After generating the abstract syntax tree, the PHP optimizer will perform various optimization operations on the abstract syntax tree. These include constant folding, redundant code elimination, loop expansion, inline functions and other optimization operations. These optimization operations can greatly improve the execution efficiency and performance of the code.

2.3 Code Generation
After performing a series of optimizations on the code, the PHP optimizer will generate the optimized code into executable machine code or bytecode. The generated machine code or bytecode can be directly executed by the PHP interpreter, thereby reducing the cost of interpretation and execution and improving the code execution speed and efficiency.

3. Code Example
   The following is a simple code example to show how the PHP7 optimizer works.

<?php
$a = 10;
$b = 20;
$c = $a + $b;
echo $c;
?>

The above code adds two variables $a and $b, assigns the result to variable $c, and finally outputs the value of variable $c. Under the work of the optimizer, the above code can be optimized into the following form:

<?php
echo 30;
?>

In this example, the optimizer discovered during the code analysis process that the values ​​​​of $a and $b are both constants, so Variables can be replaced by the value of a constant. In this way, there is no need to perform variable access operations during execution, and the results can be output directly. Such optimization can reduce the cost of variable operations and improve code execution efficiency.

4. Conclusion
   Through the discussion of the working principle of the PHP7 optimizer, we can find that PHP7 has made a series of improvements and optimizations in the underlying development principles, especially in terms of the working principle of the optimizer. . These improvements and optimizations have made PHP7 significantly improved in performance, improving code execution speed and performance. As developers, we should have a deep understanding of the working principle of the PHP7 optimizer and make full use of its optimization capabilities to improve the performance and efficiency of the code.

References:
[1] PHP Manual, Optimization
[2] PHP: Behind the Scenes, PHP Performance Crash Course, Berlin PHP Usergroup, 2016

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