The underlying development principles of PHP8’s new features: The ultimate guide to improving code performance

The underlying development principles of new features of PHP8: The ultimate guide to improving code performance

Introduction:
The PHP language has always received widespread attention and use. An extremely popular server-side scripting language. With the release of PHP8, it brings a series of new features and improvements, the most important of which is its underlying development principles, which will directly affect the performance of the code we write. This article will introduce the underlying development principles of PHP8 and provide some important guidelines to help developers better optimize their code.

1. The introduction of JIT (Just-In-Time) compiler
In PHP8, one of the most eye-catching features is the introduction of the JIT compiler. The JIT compiler can directly compile PHP code into local machine code to obtain higher execution performance during the execution phase. The JIT compiler avoids the overhead of interpretation and execution and reduces the number of function calls by compiling hot code into machine code.

To give full play to the advantages of the JIT compiler, we need to pay attention to the following points:

1. Reduce function calls: Frequent function calls will lead to performance degradation, so avoid them in critical code Unnecessary function calls are important.
2. Reduce variable assignments: Reducing unnecessary variable assignments can improve code execution efficiency. If a variable is only used in one place, the value of the variable can be used directly without assigning it to a new temporary variable.
3. Reduce loop iterations: Loops are a common operation in PHP programs, but the performance consumption of loops is also very high. Therefore, unnecessary loops need to be avoided as much as possible. You can reduce the number of loops through optimization algorithms, or use the new built-in functions in PHP8 to improve loop performance.

2. Performance improvement of attribute accessors
Before PHP8, the access speed of object attributes was relatively slow. However, in PHP8, the performance of attribute access is greatly improved by introducing more efficient attribute accessors. This is because PHP8 optimizes object properties at the bottom level, making its access speed almost no different from accessing ordinary variables.

In order to take full advantage of this improvement, there are several details worth noting:

1. Direct access to properties: When performing property access, try to access the properties of the object directly instead of using accessor or magic method. Direct attribute access is faster and can result in better performance.
2. Reduce the number of attribute accesses: Frequent attribute accesses will lead to performance degradation, so try to reduce unnecessary attribute accesses in critical code. You can avoid repeated attribute accesses by saving the access results in local variables.

3. Type system enhancement and optimization
PHP8 introduces a more powerful and strict type system, which is very important for improving the performance and reliability of the code. Enhancements to the type system not only make the code easier to understand and maintain, but also allow for more optimizations at compile time, improving the performance of the final code.

The following are some suggestions for using the type system for code optimization:

1. Use strong types: try to make the types of variables clear and avoid implicit conversions of types. Strong typing can reduce errors and improve code readability, helping the compiler to perform more optimizations.
2. Use union types: In PHP8, we can use union types to represent the possible types of variables. This can reduce the overhead of type conversion and improve the performance of the code.
3. Use strict_types directive: By using strict_types(1) at the beginning of the script to turn on strict mode, you can clarify the types of variables and functions and prevent implicit type conversion. Using strict mode reduces errors and improves the performance of your final code.

Conclusion:
PHP8 brings many key low-level improvements, which directly affect the performance of the code we write. By fully understanding the underlying development principles of PHP8 and optimizing according to some core guidelines, we can improve the performance of the code and make it more efficient. I hope that the ultimate guide provided in this article can help developers better understand and use the new features of PHP8, thereby improving the performance of their own code.

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