ZF2 Doctrine naming strategy

doctrine.global.php

<?php
return [
    'doctrine' => [
        /* ... */
        'configuration' => [
            'orm_default' => [
                'metadata_cache' => 'array',
                'query_cache' => 'array',
                'result_cache' => 'array',
                'generate_proxies' => true,
                'proxy_dir' => 'data/doctrine/proxy',
                'naming_strategy' => 'Doctrine\ORM\Mapping\UnderscoreNamingStrategy',
            ],
        ],
        /* ... */
    ],
    'service_manager' => [
        'invokables' => [
            'Doctrine\ORM\Mapping\UnderscoreNamingStrategy' => 'Doctrine\ORM\Mapping\UnderscoreNamingStrategy',
        ],
    ],
];