What functions does php8 have?

The features of php8 include JIT compiler, type system improvements, new language features, error handling improvements, performance improvements and other improved and removed features. Detailed introduction: 1. JIT compiler, which can convert hot code into machine code at runtime, and can significantly improve the performance of some CPU-intensive tasks; 2. Improvements to the type system, including the new "mixed" type, Improvements in return type declarations, parameter types, and improvements to PHPDoc type annotations; 3. New language features, etc.

The operating system of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

PHP8 is a major version update of the PHP programming language, released on November 26, 2020. It introduces many new features and improvements that improve performance, security, and development experience. The following are some important features and improvements of PHP8:

1. JIT compiler (Just-In-TimeCompiler, just-in-time compiler):

PHP8 introduces a new feature called A "JIT" just-in-time compiler that compiles PHP code into native machine code to increase execution speed. The JIT compiler can convert hot code into machine code at runtime and can significantly improve the performance of some CPU-intensive tasks. Through the JIT compiler, PHP8 can be several times faster than previous versions in some cases.

2. Type system improvements:

PHP has always been a weakly typed language, but some type system improvements were introduced in PHP8. These include the new "mixed" type, improvements to return type declarations, improvements to parameter types, and improvements to PHPDoc type annotations. These improvements make the type checking of PHP code more stringent, able to catch some potential type errors earlier, and improve the reliability and maintainability of the code.

3. New language features:

PHP8 introduces some new language features to enable developers to write code more efficiently. These include:

Null safe operator (NullsafeOperator): allows the use of concise syntax when accessing properties that may be null or calling methods that may be null, avoiding cumbersome null checks.

Match expression (MatchExpression): similar to the Switch statement, but more flexible and powerful. Match expressions can execute corresponding code blocks based on the value of the expression and support pattern matching and conditions.

Attribute initializer: In PHP8, class attributes can be initialized directly when declared, without the need for assignment in the constructor.

NamedArguments: Allows the parameters of a function or method to be passed in any order and matched by parameter name. This improves code readability and maintainability.

Static return type: PHP8 allows the return type of a method to change based on the type of object being called. This makes it possible to return different types depending on the actual instance type.

4. Error handling improvements:

PHP8 introduces some error handling improvements to make error handling more consistent and reliable. These include:

Exception improvements: PHP8 can capture and handle errors, exceptions and fatal errors through the Throwable interface, making exception handling more consistent and flexible.

New error handling functions: PHP8 introduces new error handling functions such as str_contains, str_starts_with and str_ends_with, making string processing more convenient and efficient.

Improvements in error reporting: PHP8 has improved error reporting, making error information more detailed and easier to understand.

5. Performance improvements:

PHP8 significantly improves execution speed and memory usage efficiency by introducing a JIT compiler and some performance optimizations. Compared with the PHP7.4 version, the performance improvement of PHP8 is approximately 2 times. This makes PHP8 a faster and more efficient version.

6. Other improvements and removed features:

PHP8 also introduces many other improvements and new features, such as improved string operations and new standards Library functions, syntax improvements, removal of some obsolete and deprecated features, etc. These improvements and removed features make PHP 8 more modern, easier to develop and maintain, and have better performance and security.

It should be noted that due to some new language features and improvements introduced by PHP8, some old code may need to be adjusted to run on PHP8. Therefore, before upgrading to PHP8, it is recommended to conduct adequate testing and code review to ensure that the application can run properly.

In general, PHP8 is a major version update that introduces many new features and improvements to improve performance, security and development experience. It is an important milestone for the PHP programming language and will bring better work efficiency and code quality to developers.

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