PHP Classes / Objects

class Person {
    public string $name;
    public int    $age;

    public function __construct(string $name, int $age) {
        $this->name = $name;
        $this->age  = $age;
    }

    public function greet(): string {
        return "Hi, I am {$this->name}";
    }
}

$p = new Person('Ada', 36);
echo $p->greet();

class Person {
    public function __construct(
        public string $name,
        public int $age,
    ) {}

    public function greet(): string {
        return "Hi, I am {$this->name}";
    }
}

class Money {
    public function __construct(
        public readonly int $cents,
        public readonly string $currency = 'USD',
    ) {}
}

$m = new Money(1000);
// $m->cents = 2000;     // Error — cannot modify readonly

class Counter {
    private int $count = 0;

    public function bump(): self {
        $this->count++;
        return $this;     // for fluent chaining
    }

    public function value(): int {
        return $this->count;
    }
}

echo (new Counter())->bump()->bump()->bump()->value();   // 3

<?php
class Person {
    public function __construct(
        public string $name,
        public int $age,
    ) {}
    public function greet(): string {
        return "Hi, I am {$this->name}";
    }
}
$p = new Person('Ada', 36);
echo $p->greet();