factory.php

<?php

interface Support {}

class TechnicalSupport implements Support {}

class FinancialSupport implements Support {}

class AdministrativeSupport implements Support {}

class SupportFactory
{
    public function createByType($type)
    {
        $class = $type.'Support';

        if (!class_exists($class)) {
            throw new InvalidArgumentException("there is no class $class");
        }

        return new $class;
    }
}