imports:
    - { resource: config.yml }
    - { resource: security.yml }

framework:
    router:
        resource: "%kernel.root_dir%/config/routing_dev.yml"
        strict_requirements: true
    profiler: ~ #{ only_exceptions: false }

web_profiler:
    toolbar: %debug_toolbar%
    intercept_redirects: %debug_redirects%

monolog:
    handlers:
        main:
            type:   stream
            path:   "%kernel.logs_dir%/%kernel.environment%.log"
            level:  debug
            channels: [!event]
        console:
            type:   console
            bubble: false
        # uncomment to get logging in your browser
        # you may have to allow bigger header sizes in your Web server configuration
#        firephp:
#            type:   firephp
#            level:  info
        chromephp:
            type:   chromephp
            level:  info
swiftmailer:
    disable_delivery: true
#    delivery_address: me@example.com

imports:
    - { resource: config.yml }
    - { resource: security.yml }

framework:
    router:
        resource: "%kernel.root_dir%/config/routing_dev.yml"
        strict_requirements: true
    profiler: ~ #{ only_exceptions: false }

web_profiler:
    toolbar: %debug_toolbar%
    intercept_redirects: %debug_redirects%

monolog:
    handlers:
        main:
            type:   stream
            path:   "%kernel.logs_dir%/%kernel.environment%.log"
            level:  debug
            channels: [!event]
        console:
            type:   console
            bubble: false
swiftmailer:
    disable_delivery: true
#    delivery_address: me@example.com

Change for updating symfony standard edition to 2.4
Change for updating symfony standard edition to 2.4

From guide at:
https://github.com/symfony/symfony-standard/blob/2.8/UPGRADE-2.4.md
