gistfile1.php

<?php

class MyDevelopmentServiceManager
{
    protected $factories = array(
        'Foo' => '\MyModule\Foo',
        'Bar' => '\MyModule\Bar',
    );

    protected $instances;

    protected function getNewInstance($name)
    {
        if (!isset($this->factories[$name]) {
            throw new Exception('...!');
        }

        return new $this->factories[$name];
    }

    public function getInstance($name)
    {
        if (!isset($this->instances[$name])) {
            $this->instances[$name] = $this->getNewInstance($name);
        }

        return $this->instances[$name];
    }
}

class MyProductionServiceManager
{
    protected function getNewInstance($name)
    {
        switch($name) {

            // DO NOT MODIFY: AUTO-GENERATED CODE!

            case 'Foo':
                retun new \MyModule\Foo;

            case 'Bar':
                retun new \MyModule\Foo;

            default:
                throw new Exception('...!');
        }
    }

    public function getInstance($name)
    {
        if (!isset($this->instances[$name])) {
            $this->instances[$name] = $this->getNewInstance($name);
        }

        return $this->instances[$name];
    }
}