PHP 8.3 — Features and Syntax Quick Reference

New in PHP 8.3

PHP 8.x Features in Use

// Named arguments (8.0)
array_slice(array: $arr, offset: 2, length: 5);

// Match expression (8.0)
$result = match($status) {
    'active' => 'Online',
    'banned' => 'Blocked',
    default  => 'Unknown',
};

// Nullsafe operator (8.0)
$city = $user?->getAddress()?->getCity();

// Fibers (8.1)
$fiber = new Fiber(fn() => 'done');

// Enums (8.1)
enum Status: string {
    case Active = 'active';
    case Banned = 'banned';
}

// Readonly properties (8.1)
class User {
    public function __construct(
        public readonly int $id,
        public readonly string $email,
    ) {}
}

// First class callables (8.1)
$fn = strlen(...);

// Intersection types (8.1)
function foo(Countable&Iterator $x) {}

// readonly classes (8.2)
readonly class Point {
    public function __construct(
        public float $x,
        public float $y,
    ) {}
}

Common Patterns

// Strict types (always use)
declare(strict_types=1);

// Type-safe DB value
$id = (int) DB::value("SELECT id FROM ...");

// Null coalescing
$name = $_POST['name'] ?? 'default';

// Spread operator
$merged = [...$arr1, ...$arr2];

// Array destructuring
[$first, $second] = $array;
[, $second] = $array;  // skip first

// Short closure
$double = fn($x) => $x * 2;