security(界面访问控制)

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3. app/config/config.yml

   security:
       providers:
           main:
               memory:
                   users:
                       admin:
                           password: 123456
                           roles: 'ROLE_ADMIN'
       encoders:
           Symfony\Component\Security\Core\User\User: plaintext
       firewalls:
           dev:
               pattern: ^/(_(profiler|wdt)|css|images|js)/
               security: false
           main:
               http_basic: ~
               form_login: ~
       access_control:
           - { path: ^/admin, roles: ROLE_ADMIN }