Twig Components / Methods / integer

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integer is a Twig test to test a value for being an integer (like is_int in PHP).

It uses the mentioned PHP functions / comparisons internally, so you have the same behavior as in PHP.

{% if somevar is integer %} {# no equivalent in Twig %} #}
{% endif %}
{% if somevar is int %} {# same as integer test above, alternate way to write it %} #}
{% endif %}

Source: Squirrelphp