``dump``
========
.. versionadded:: 1.5
The dump function was added in Twig 1.5.
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:
.. code-block:: jinja
{{ 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:
.. code-block:: jinja
<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:
.. code-block:: jinja
{{ dump(user, categories) }}
If you don't pass any value, all variables from the current context are
dumped:
.. code-block:: jinja
{{ dump() }}
.. note::
Internally, Twig uses the PHP `var_dump`_ function.
Arguments
---------
* ``context``: The context to dump
.. _`XDebug`: http://xdebug.org/docs/display
.. _`var_dump`: http://php.net/var_dump
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