PHP Version

• 每个版本支持 2 年，+1 年安全修复
• 参考
  • https://www.php.net/supported-versions.php
  • https://www.php.net/eol.php

Version	date	active/eol
PHP 8.4
PHP 8.3	2023-11-23	2025-11-31
PHP 8.2	2022-12-08	2024-11-31
PHP 8.1	2021-11-25	2023-12-28
PHP 8.0	2020-11-26
PHP 7.4	2019-11-28	2022-11-28

PHP 8.4

• JIT
  • new JIT implementation based on IR https://php.watch/rfcs/jit-ir

PHP 8.3

• lint - php -l
• json_validate
• gc_status
• class_alias

<?php
class Test {
    // Typed Class Constants
    const string TEST_CONSTANT = 'test';
}

$constName = 'TEST_CONSTANT';

// Dynamic class constant and Enum member fetch support
echo MyClass::{$constName};

PHP 8.2

• readonly 类

<?php
readonly class BlogData
{
    public string $title;

    public Status $status;

    public function __construct(string $title, Status $status)
    {
        $this->title = $title;
        $this->status = $status;
    }
}

• Disjunctive Normal Form (DNF) 类型

<?php
class Foo {
    public function bar((A&B)|null $entity) {
        return $entity;
    }
}

• null, false, true 作为独立类型
• trait 支持包含 const
• 参考
  • https://www.php.net/releases/8.2/en.php

PHP 8.1

• fiber
  • amphp
• enum

<?php
enum Status
{
    case Draft;
    case Published;
    case Archived;
}

• readonly 属性

<?php
class BlogData
{
    public readonly Status $status;

    public function __construct(Status $status)
    {
        $this->status = $status;
    }
}

• first class callable

<?php
// 类似于 获取函数引用
$foo = $this->foo(...);
$fn = strlen(...);

• Intersection Types

<?php
function count_and_iterate(Iterator&Countable $value) {
    foreach ($value as $val) {
        echo $val;
    }

    count($value);
}

• never 类型 - 不返回
• array spread

<?php
$arrayA = ['a' => 1];
$arrayB = ['b' => 2];

// array_merge
$result = ['a' => 0, ...$arrayA, ...$arrayB];

• 参考
  • https://www.php.net/releases/8.1/en.php

PHP 8.0

• JIT
• 语法
  • match
  • static, mixed
  • nullsafe $user->getBirthday()?->diffForHumans()
• stdlib
  • WeakMap
  • DateTime
  • Stringable
• 命名参数
• Attributes
• Union 类型 int|float
• Nullsafe operator - ?->
• 0 == 'foobar'
  • true -> false

<?php
// 类似 python 语法
htmlspecialchars($string, double_encode: false);

// 类似 java annotation、js decorator
class PostsController
{
    #[Route("/api/posts/{id}", methods: ["GET"])]
    public function get($id) { /* ... */ }
}

// 构造函数属性
class Point {
  public function __construct(
    public float $x = 0.0,
    public float $y = 0.0,
    public float $z = 0.0,
  ) {}
}

// Match 表达式
// 类似 go 的 select
echo match (8.0) {
  '8.0' => "Oh no!",
  8.0 => "This is what I expected",
};

• 参考
  • https://www.php.net/releases/8.0/en.php

PHP 7.4

• 属性类型 - public int $id
• 限定返回类型
• ??=
• array spread
• 箭头函数 - fn($x) => $x * $x
• 数字 _ 分割
• FFI
• WeakReference
• 参考
  • https://www.php.net/releases/7_4_0.php

PHP 7.3

• Array Destructuring
  • 支持引用

PHP 7.2

• Object typehint

PHP 7.1

• Nullable
• void 返回类型
• Iterable 类型
• list []， 支持 key

PHP 7.0

• Zend Engine
• Anonymous Classes
• ?? - null coalescing operator

PHP 5.6