PHP 8.3 GA

• 类常量显式类型 (Typed class constants)

• 只读属性深拷贝

• 新增#[\Override] 属性

• 新增 json_validate() 函数

• 添加 Randomizer::getBytesFromString() 方法

• 添加 Randomizer::getFloat() 和 Randomizer::nextFloat() 方法

• 以及更好的性能、更好的语法、改进类型安全

• 类型化类常量

interface I {
    // We may naively assume that the PHP constant is always a string.
    const PHP = 'PHP 8.2';
}

class Foo implements I {
    // But implementing classes may define it as an array.
    const PHP = [];
}

PHP 8.3

interface I {
    const string PHP = 'PHP 8.3';
}

class Foo implements I {
    const string PHP = [];
}

// Fatal error: Cannot use array as value for class constant
// Foo::PHP of type string

• 动态获取类常量

class Foo {
    const PHP = 'PHP 8.2';
}

$searchableConstant = 'PHP';

var_dump(constant(Foo::class . "::{$searchableConstant}"));

PHP 8.3

class Foo {
    const PHP = 'PHP 8.3';
}

$searchableConstant = 'PHP';

var_dump(Foo::{$searchableConstant});

• 只读属性深拷贝

class PHP {
    public string $version = '8.2';
}

readonly class Foo {
    public function __construct(
        public PHP $php
    ) {}

    public function __clone(): void {
        $this->php = clone $this->php;
    }
}

$instance = new Foo(new PHP());
$cloned = clone $instance;

// Fatal error: Cannot modify readonly property Foo::$php

PHP 8.3

class PHP {
    public string $version = '8.2';
}

readonly class Foo {
    public function __construct(
        public PHP $php
    ) {}

    public function __clone(): void {
        $this->php = clone $this->php;
    }
}

$instance = new Foo(new PHP());
$cloned = clone $instance;

$cloned->php->version = '8.3';

• 新增#[\Override] 属性

use PHPUnit\Framework\TestCase;

final class MyTest extends TestCase {
    protected $logFile;

    protected function setUp(): void {
        $this->logFile = fopen('/tmp/logfile', 'w');
    }

    protected function taerDown(): void {
        fclose($this->logFile);
        unlink('/tmp/logfile');
    }
}

// The log file will never be removed, because the
// method name was mistyped (taerDown vs tearDown).

PHP 8.3

use PHPUnit\Framework\TestCase;

final class MyTest extends TestCase {
    protected $logFile;

    protected function setUp(): void {
        $this->logFile = fopen('/tmp/logfile', 'w');
    }

    #[\Override]
    protected function taerDown(): void {
        fclose($this->logFile);
        unlink('/tmp/logfile');
    }
}

// Fatal error: MyTest::taerDown() has #[\Override] attribute,
// but no matching parent method exists

• 新增 json_validate() 函数

function json_validate(string $string): bool {
    json_decode($string);

    return json_last_error() === JSON_ERROR_NONE;
}

var_dump(json_validate('{ "test": { "foo": "bar" } }')); // true

PHP 8.3

var_dump(json_validate('{ "test": { "foo": "bar" } }')); // true

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