The dump function dumps information about a template variable. This is mostly useful to debug a template that does not behave as expected by introspecting its variables:
{{ dump(user) }}
Note
The dump function is not available by default. You must add the Twig_Extension_Debug extension explicitly when creating your Twig environment:
$twig = new Twig_Environment($loader, array(
'debug' => true,
// ...
));
$twig->addExtension(new Twig_Extension_Debug());
Even when enabled, the dump function won't display anything if the debug option on the environment is not enabled (to avoid leaking debug information on a production server).
In an HTML context, wrap the output with a pre tag to make it easier to read:
<pre>
{{ dump(user) }}
</pre>
Tip
Using a pre tag is not needed when XDebug is enabled and html_errors is on; as a bonus, the output is also nicer with XDebug enabled.
You can debug several variables by passing them as additional arguments:
{{ dump(user, categories) }}
If you don't pass any value, all variables from the current context are dumped:
{{ dump() }}
Note
Internally, Twig uses the PHP var_dump function.
context: The context to dump
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https://twig.sensiolabs.org/doc/2.x/functions/dump.html