PHP 8.4.2 Released!
    Released!
    PHP 8.2 is a major update of the PHP language.
    It contains many new features, including readonly classes, null, false, and true as stand-alone types, deprecated dynamic properties, performance improvements and more.
    Upgrade to PHP 8.2 now!

    Readonly classes RFC Doc

    PHP < 8.2
    class BlogData
    {
    public readonly     string $title;

    public readonly     Status $status;

    public function     __construct(string $title, Status $status)
    {
    $this->title = $title;
    $this->status = $status;
    }
    }
    PHP 8.2
    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) Types RFC Doc

    PHP < 8.2
    class Foo {
    public function     bar(mixed $entity) {
    if (((    $entity instanceof A) && ($entity instanceof B)) || ($entity === null)) {
    return     $entity;
    }

    throw new     Exception('Invalid entity');
    }
    }
    PHP 8.2
    class Foo {
    public function     bar((A&B)|null $entity) {
    return     $entity;
    }
    }
    DNF types allow us to combine union and intersection types, following a strict rule: when combining union and intersection types, intersection types must be grouped with brackets.

    Allow null, false, and true as stand-alone types RFC RFC

    PHP < 8.2
    class Falsy
    {
    public function     almostFalse(): bool { /* ... */ *}

    public function     almostTrue(): bool { /* ... */ *}

    public function     almostNull(): string|null { /* ... */ *}
    }
    PHP 8.2
    class Falsy
    {
    public function     alwaysFalse(): false { /* ... */ *}

    public function     alwaysTrue(): true { /* ... */ *}

    public function     alwaysNull(): null { /* ... */ *}
    }

    New "Random" extension RFC RFC Doc

    PHP 8.2
    use Random\Engine\Xoshiro256StarStar;
    use     Random\Randomizer;

    $blueprintRng = new Xoshiro256StarStar(
    hash('sha256', "Example seed that is converted to a 256 Bit string via SHA-256", true)
    );

    $fibers = [];
    for (    $i = 0; $i < 8; $i++) {
    $fiberRng = clone $blueprintRng;
    // Xoshiro256**'s 'jump()' method moves the blueprint ahead 2**128 steps, as if calling
    // 'generate()' 2**128 times, giving the Fiber 2**128 unique values without needing to reseed.
    $blueprintRng->jump();

    $fibers[] = new Fiber(function () use ($fiberRng, $i): void {
    $randomizer = new Randomizer($fiberRng);

    echo     "{$i}: " . $randomizer->getInt(0, 100), PHP_EOL;
    });
    }

    // The randomizer will use a CSPRNG by default.
    $randomizer = new Randomizer();

    // Even though the fibers execute in a random order, they will print the same value
    // each time, because each has its own unique instance of the RNG.
    $fibers = $randomizer->shuffleArray($fibers);
    foreach (    $fibers as $fiber) {
    $fiber->start();
    }

    The "random" extension provides a new object-oriented API to random number generation. Instead of relying on a globally seeded random number generator (RNG) using the Mersenne Twister algorithm the object-oriented API provides several classes ("Engine"s) providing access to modern algorithms that store their state within objects to allow for multiple independent seedable sequences.

    The \Random\Randomizer class provides a high level interface to use the engine's randomness to generate a random integer, to shuffle an array or string, to select random array keys and more.

    Constants in traits RFC Doc

    PHP 8.2
    trait Foo
    {
    public const     CONSTANT = 1;
    }

    class     Bar
    {
    use     Foo;
    }

    var_dump(Bar::CONSTANT); // 1
    var_dump(Foo::CONSTANT); // Error
    You cannot access the constant through the name of the trait, but, you can access the constant through the class that uses the trait.

    Deprecate dynamic properties RFC Doc

    PHP < 8.2
    class User
    {
    public     $name;
    }

    $user = new User();
    $user->last_name = 'Doe';

    $user = new stdClass();
    $user->last_name = 'Doe';
    PHP 8.2
    class User
    {
    public     $name;
    }

    $user = new User();
    $user->last_name = 'Doe'; // Deprecated notice

    $user = new stdClass();
    $user->last_name = 'Doe'; // Still allowed

    The creation of dynamic properties is deprecated to help avoid mistakes and typos, unless the class opts in by using the #[\AllowDynamicProperties] attribute. stdClass allows dynamic properties.

    Usage of the __get/__set magic methods is not affected by this change.

    New Classes, Interfaces, and Functions

    Deprecations and backward compatibility breaks

    Better performance, better syntax, improved type safety.

    Upgrade to PHP 8.2 now!

    For source downloads of PHP 8.2 please visit the downloads page. Windows binaries can be found on the PHP for Windows site. The list of changes is recorded in the ChangeLog.

    The migration guide is available in the PHP Manual. Please consult it for a detailed list of new features and backward-incompatible changes.

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