Twig comes with its own Debug extension to allow users to output “var_dump()” — the function that spits out the raw values behind a PHP variable, array or object — inside a Twig template.  This functions is helpful in the dev environment while trying to debug code.

Step 1:  Add the following to the /app/config/config_dev.yml (don’t add this to config_prod.yml):

twig: 
    debug: 1
services:
    debug.twig.extension:
        class: Twig_Extensions_Extension_Debug
        tags: [{ name: 'twig.extension' }]

Step 2:  Inside any Twig template, you can “var_dump” variables using the Twig Debug Extension:
{% debug varName %} 

– Aaron Belchamber
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