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ifΒΆ

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:

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{% 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:

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{% 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:

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{% if kenny.sick %}
    Kenny is sick.
{% elseif kenny.dead %}
    You killed Kenny! You bastard!!!
{% else %}
    Kenny looks okay --- so far
{% endif %}

Note

The rules to determine if an expression is true or false are the same as in PHP; here are the edge cases rules:

Value Boolean evaluation
empty string false
numeric zero false
whitespace-only string true
empty array false
null false
non-empty array true
object true
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