I'm using PHP7.0.8 and the doctrine cache (with APCU) in my symfony project. When I call function from my controllers which use this cache, no problems, It works fine !
But when I create a command file which use a repository which use the doctrine cache, and when I run this command on my shell, I've the error :
[Symfony\Component\Debug\Exception\UndefinedFunctionException]
Attempted to call function "apcu_fetch" from namespace "Doctrine\Common\Cache".
My configuration :
doctrine:
dbal:
    driver:   pdo_mysql
    host:     "%database_host%"
    port:     "%database_port%"
    dbname:   "%database_name%"
    user:     "%database_user%"
    password: "%database_password%"
    charset:  UTF8
orm:
    auto_generate_proxy_classes: "%kernel.debug%"
    entity_managers:
        default:
            auto_mapping: true
            mappings:
                StofDoctrineExtensionsBundle: ~
            metadata_cache_driver: apcu
            query_cache_driver: apcu
            result_cache_driver: apcu
The same code works if I run it in a controller :( I think it's a bug, any idea ?