Module.php
public function getServiceConfig()
	{
		return array(
			'factories' => array(
				'CronHelper\Service\CronService' => function ($serviceManager) {
					$mainConfig = $serviceManager->get('config');
					$serviceConfig = array();

					if (is_array($mainConfig)) {
						if (array_key_exists('cron_helper', $mainConfig)) {
							$serviceConfig = $mainConfig['cron_helper'];
						}
					}

					$cronService = new CronService($serviceConfig);
					return $cronService;
				},
			),
		);
	}
public function getServiceConfig()
	{
		return array(
			'factories' => array(
				'CronHelper\Service\CronService' => function ($serviceManager) {
					$mainConfig = $serviceManager->get('config');
					$serviceConfig = array();

					if (is_array($mainConfig)) {
						if (array_key_exists('cron_helper', $mainConfig)) {
							$serviceConfig = $mainConfig['cron_helper'];
						}
					}

					$cronService = new CronService($serviceConfig);
					return $cronService;
				},
			),
		);
	}
Retrieve configuration for the service manager

@return array