What is the correct way to implement many small classes with similar functionality and one parent?

Question

PHP

The formulation of such a question was not such a simple thing.
Problem: There is a certain numeric parameter that needs to be formatted in many ways. The user needs to be given a choice of formatting type with the output of its name.
Sounds confusing. I was trying to make one class a parent that implements the format($value) method.
And a lot of descendant classes, each of which offers its own implementation of the format method and which has a field for formatting description. But I ran into the problem of automatically loading all these classes (there will be two dozen of them, no less). And the unification of the formatting method call.
Case: The user entered a number. I have to give him a list of all the formatting methods that are available. For example:
1. Cut off 1 character ahead.
2. Multiply by 10.
and so on.
When choosing a method, it must be applied to a number.
Please tell me the best solution for the problem.

Answer 1

class NumberManager
{
    /**
     * Форматирование чисел
     * @param integer $number Число
     * @param string $formatClass Класс для форматирования
     * @param array $formatClassParams Параметры для класса форматирования
     * return bool
     */
    public function format($number, $formatClass, $formatClassParams = [])
    {
        // Создаём экземляр класса для форматирования
        $formatClassName = $formatClass . 'Format';
        if (!class_exists($formatClassName)) {
               return false;
        }

        $formatter = new $formatClass();
        // Передаём этому классу число, параметры форматирования и получаем результат
        return $formatter->formatNumber($number, $formatClassParams);
    }
}