Exemplos PHP 8 - Code Easy - DO NOT DELETE

attributes.php

<?php

#[Attribute]
class Letter
{
    public const UPPER_CASE = 'UPPER_CASE';
    public const LOWER_CASE = 'LOWER_CASE';
    public const FIRST_CHARACTER_UPPER_CASE = 'FIRST_CASE_UPPER';

    public function __construct(
        public string $modifier
    ) {}

    public static function action(object $object): void
    {
        $reflectionClass = new reflectionClass($object::class);
        $properties = $reflectionClass->getProperties();

        foreach ($properties as $property) {
            $property->setAccessible(true);
            $attributes = $property->getAttributes(self::class);

            foreach ($attributes as $attribute) {
                $modifier = $attribute->newInstance()->modifier;
                $value = $property->getValue($object);

                $newValue = match ($modifier) {
                    self::UPPER_CASE => strtoupper($value),
                    self::LOWER_CASE => strtolower($value),
                    self::FIRST_CHARACTER_UPPER_CASE => ucfirst(strtolower($value)),
                    default => $value,
                };

                $property->setValue($object, $newValue);
            }
        }
    }
}

class Person
{
    #[Letter(Letter::LOWER_CASE)]
    private string $name;

    public function setName(string $name): self
    {
        $this->name = $name;
        Letter::action($this);

        return $this;
    }

    public function getName(): string
    {
        return $this->name;
    }
}

$person1 = new Person();
$person1->setName('FeLiPe');

var_dump($person1);

constructor_property_promotion.php

<?php

interface IVehicle
{
    public function move(): string;
}

class Car implements IVehicle
{
    public function move(): string
    {
        return "The car is moving...\n";
    }
}

class Motorcycle implements IVehicle
{
    public function move(): string
    {
        return "The motorcycle is moving...\n";
    }
}

// ============================

// BEFORE

class Before
{
    private IVehicle $vehicle;

    public function __construct(IVehicle $vehicle)
    {
        $this->vehicle = $vehicle;
    }

    public function execute(): void
    {
        echo "Before: {$this->vehicle->move()}";
    }
}

(new Before(new Car()))->execute();
(new Before(new Motorcycle()))->execute();

// After

class After
{
    public function __construct(private IVehicle $vehicle) {}

    public function execute(): void
    {
        echo "After: {$this->vehicle->move()}";
    }
}

(new After(new Car()))->execute();
(new After(new Motorcycle()))->execute();

match_expression.php

<?php

// switch
// igualdade ==

echo 'Switch: ';

switch (8.0) {
    case '8.0':
        echo "Wrong\n";
        break;

    case 8.0:
        echo "Right\n";
        break;

    default:
        echo "Why are you here?\n";
        break;
}

// match
// identidade ===

echo 'Match: ' . match (8.0) {
    '8.0' => "Wrong\n",
    8.0 => "Right\n",
    default => "Why are you here?\n",
};

named_arguments.php

<?php

function buildMessage(string $greeting = 'Hello', string $name = 'Code Easy'): string
{
    return "{$greeting} {$name}";
}

// BEFORE
$before = buildMessage('Hello', 'Felipe');

// AFTER
$after = buildMessage(name: 'Felipe');

// ====================================

echo $before;
echo "\n";
echo $after;
echo "\n";

union_types.php

<?php

declare(strict_types=1);

// Before

/**
 * @param float|int ...$numbers
 * @return float|int
 */
function sumBefore(...$numbers)
{
    $result = 0;

    foreach ($numbers as $number) {
        $result += $number;
    }

    return $result;
}

var_dump(sumBefore(4.5, 5.5, 10));
echo "\n";

// After

function sumAfter(float|int ...$numbers): float|int
{
    $result = 0;

    foreach ($numbers as $number) {
        $result += $number;
    }

    return $result;
}

var_dump(sumAfter(4.5, 5.5, 10));
echo "\n";