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:

{% 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:

{% 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.

You can also use not to check for values that evaluate to false:

{% if not user.sub	          			          		登录查看完整内容