Clase Pizza Patron Builder PHP

<?php

class Pizza {
    private $tamaño;
    private $masa;
    private $orillaConQueso;
    private $ingredientes;

    private function __construct($builder) {
        $this->tamaño = $builder->tamaño;
        $this->masa = $builder->masa;
        $this->orillaConQueso = $builder->orillaConQueso;
        $this->ingredientes = $builder->ingredientes;
    }

    public static function builder() {
        return new PizzaBuilder();
    }

    public function mostrar() {
        echo "Pizza: $this->tamaño, $this->masa, orilla con queso: " . ($this->orillaConQueso ? "sí" : "no") . ", ingredientes: $this->ingredientes\n";
    }

    // Clase Builder
    class PizzaBuilder {
        public $tamaño;
        public $masa;
        public $orillaConQueso = false;
        public $ingredientes;

        public function tamaño($tamaño) {
            $this->tamaño = $tamaño;
            return $this;
        }

        public function masa($masa) {
            $this->masa = $masa;
            return $this;
        }

        public function orillaConQueso($orillaConQueso) {
            $this->orillaConQueso = $orillaConQueso;
            return $this;
        }

        public function ingredientes($ingredientes) {
            $this->ingredientes = $ingredientes;
            return $this;
        }

        public function build() {
            return new Pizza($this);
        }
    }
}

// USO:
$pizza = Pizza::builder()
    ->tamaño("Mediana")
    ->masa("Gruesa")
    ->orillaConQueso(true)
    ->ingredientes("Jamón, Aceitunas")
    ->build();

$pizza->mostrar();
?>