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:

{% 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:

{% 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:

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

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https://twig.symfony.com/doc/1.x/tags/with.html