IntersectionType.php

<?php
 
namespace DaveRandom\CallbackValidator\Type;
 
final class IntersectionType implements BaseType{
    public function __construct(
        public readonly array $types,
    ){}
 
    public function stringify(int $depth = 0) : string{
        $result = implode('&', array_map(fn($type) => $type->stringify($depth + 1), $this->types));
        return $depth === 0 ? $result : "($result)";
    }
}