``if``
======
The ``if`` statement in Twig is comparable with the if statements of PHP.
In the simplest form you can use it to test if an expression evaluates to
``true``:
.. code-block:: jinja
{% if online == false %}
<p>Our website is in maintenance mode. Please, come back later.</p>
{% endif %}
You can also test if an array is not empty:
.. code-block:: jinja
{% if users %}
<ul>
{% for user in users %}
<li>{{ user.username|e }}</li>
{% endfor %}
</ul>
{% endif %}
.. note::
If you want to test if the variable is defined, use ``if users is
defined`` instead.
For multiple branches ``elseif`` and ``else`` can be used like in PHP. You can use
more complex ``expressions`` there too:
.. code-block:: jinja
{% if kenny.sick %}
Kenny is sick.
{% elseif kenny.dead %}
You killed Kenny! You bastard!!!
{% else %}
Kenny looks okay --- so far
{% endif %}
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