ZF2 ServiceManager config example

sm.config.php

<?php

return [
    'factories' => [
       'Db' => function ($sm) {
            $dbConfig = $sm->get('db_config');
            
            $db = new PDO(
                $dbConfig['dsn'], 
                $dbConfig['user'], 
                $dbConfig['pass'], 
                $dbConfig['driver_options']
            );
            
            return $db;
        },
    ],
    'services' => [
        'db_config' => [
            'dsn' => 'dsn:foo=bar;baz=bat',
            'user' => 'johndoe',
            'pass' => 'secret',
            'driver_options' => [],
        ],
    ],
];