Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

<?php
class Product
{
    // Properties (typed since PHP 7.4)
    public string  $name;
    public float   $price;
    public int     $stock;

// Constructor
    public function __construct(string $name, float $price, int $stock = 0)
    {
        $this->name  = $name;
        $this->price = $price;
        $this->stock = $stock;
    }

// Method
    public function totalValue(): float
    {
        return $this->price * $this->stock;
    }

public function isInStock(): bool
    {
        return $this->stock > 0;
    }

public function describe(): string
    {
        return sprintf(
            '%s — $%.2f (%d in stock)',
            $this->name,
            $this->price,
            $this->stock
        );
    }
}

// Instantiate
$widget = new Product('Widget', 9.99, 50);
$gadget = new Product('Gadget', 49.99);

echo $widget->describe();       // Widget — $9.99 (50 in stock)
echo $widget->totalValue();     // 499.5
echo $gadget->isInStock() ? 'In stock' : 'Out of stock'; // Out of stock

// Multiple independent instances
$a = new Product('Alpha', 1.00, 10);
$b = new Product('Beta',  2.00, 5);
echo $a->name; // Alpha
echo $b->name; // Beta  — separate objects