Litipk\BigNumber

Decimal.php

<?php
namespace Litipk\BigNumbers;

class Decimal
{
    public static function fromInteger(int $intValue): Decimal // notify IDE Decimal object
    {
        self::paramsValidation($intValue, null);

        return new static((string)$intValue, 0); // use static (not self). Price object, not Decimal
    }
}

Price.php

<?php
namespace App\Entity;

use Litipk\BigNumbers\Decimal;

class Price extends Decimal
{
    public function getValue()
    {
        return (string)$this;
    }
}


$price = Price::fromInteger(123); // Price object