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with

New in version 1.28

The with tag was added in Twig 1.28.

Use the with tag to create a new inner scope. Variables set within this scope are not visible outside of the scope:

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{% with %}
    {% set foo = 42 %}
    {{ foo }}           foo is 42 here
{% endwith %}
foo is not visible here any longer

Instead of defining variables at the beginning of the scope, you can pass a hash of variables you want to define in the with tag; the previous example is equivalent to the following one:

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{% with { foo: 42 } %}
    {{ foo }}           foo is 42 here
{% endwith %}
foo is not visible here any longer

{# it works with any expression that resolves to a hash #}
{% set vars = { foo: 42 } %}
{% with vars %}
    ...
{% endwith %}

By default, the inner scope has access to the outer scope context; you can disable this behavior by appending the only keyword:

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{% set bar = 'bar' %}
{% with { foo: 42 } only %}
    {# only foo is defined #}
    {# bar is not defined #}
{% endwith %}
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