How to Access the User, Request, Session & more in Twig via the app Variable

During each request, Symfony will set a global template variable app in both Twig and PHP template engines by default. The app variable is a AppVariable instance which will give you access to some application specific variables automatically:

app.security (deprecated as of 2.6)

The SecurityContext object or null if there is none.

app.user

The representation of the current user or null if there is none. The value stored in this variable can be a UserInterface object, any other object which implements a __toString() method or even a regular string.

app.request

The Request object that represents the current request (depending on your application, this can be a sub-request or a regular request, as explained later).

app.session

The Session object that represents the current user's session or null if there is none.

app.environment

The name of the current environment (dev, prod, etc).

app.debug

True if in debug mode. False otherwise.

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<p>Username: {{ app.user.username }}</p>
{% if app.debug %}
    <p>Request method: {{ app.request.method }}</p>
    <p>Application Environment: {{ app.environment }}</p>
{% endif %}