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if-Documentation-Twig-The flexible, fast, and secure PHP template engine

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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 %}


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:

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{% if not user.subscribed %} <p>You are not subscribed to our mailing list.</p> {% endif %}

For multiple conditions, and and or can be used:

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{% if temperature > 18 and temperature < 27 %} <p>It's a nice day for a walk in the park.</p> {% endif %}

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 product.stock > 10 %} Available {% elseif product.stock > 0 %} Only {{ product.stock }} left! {% else %} Sold-out! {% endif %}


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
NAN (Not A Number) true
INF (Infinity) true
whitespace-only string true
string “0” or ‘0’ false
empty array false
null false
non-empty array true
object true

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