What are the new features and application scenarios of PHP8?

What are the new functions and uses brought by PHP8?

PHP8 is the latest version of the PHP programming language, officially released in November 2020. It introduces many important new features, providing developers with more tools and options to improve the quality and performance of their code. The following will introduce some new functions and uses brought by PHP8, and attach specific code examples.

1. JIT compiler:
   PHP8 introduces the Just-in-Time (JIT) compiler, which can dynamically compile PHP code into local machine code, thus improving execution speed. The JIT compiler can optimize according to the actual situation of the code at runtime to further optimize performance.

The following is a sample code using the JIT compiler:

<?php
function multiply($a, $b) {
    return $a * $b;
}

echo multiply(2, 3);
?>

2. Improvements in classes and interfaces:
   PHP8 has made some improvements to classes and interfaces, including New property access modifiers and more powerful type checking. These improvements make code more secure and provide better code hints and auto-completion.

The following is a sample code using the new property access modifier:

<?php
class Person {
    public string $name;
    protected int $age;
    private string $gender;

    public function __construct($name, $age, $gender) {
        $this->name = $name;
        $this->age = $age;
        $this->gender = $gender;
    }
}

$person = new Person("John", 25, "Male");
echo $person->name;
?>

3. Strong type declaration:
   PHP8 introduced strong type declaration, which can be used in functions and The types of parameters and return values ​​are clearly specified in the method. This helps reduce bugs caused by type errors and improves code readability and maintainability.

The following is a sample code using strong type declaration:

<?php
function multiply(int $a, int $b): int {
    return $a * $b;
}

echo multiply(2, 3);
?>

4. New error handling mechanism:
   PHP8 introduces a new error handling mechanism, using the new Throwable interface to handle exceptions. This makes handling exceptions more flexible, and exceptions can be divided into different types for handling.

The following is a sample code using the new error handling mechanism:

<?php
function divide($a, $b) {
    try {
        if ($b == 0) {
            throw new Exception("Division by zero is not allowed.");
        } else {
            return $a / $b;
        }
    } catch (Exception $e) {
        echo $e->getMessage();
    }
}

echo divide(6, 0);
?>

Summary:
PHP8 brings many exciting new features and uses. It provides developers with more tools and options to improve code quality and performance. Whether it is using the JIT compiler to improve execution speed, taking advantage of improved classes and interfaces to write safer code, and using strong type declarations and new error handling mechanisms, PHP8 provides developers with a better programming experience. and greater efficiency.

Reference:

• "What's New in PHP 8: A Look at New Features and Improvements" - https://www.toptal.com/php/what-is- new-php-8

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