How to check variable type?

Question

How do I check what type my variable of (string, integer, boolean, array, dictionary, etc)?

Answer 1

I needed this feature today, so I've put together a simple plugin, which does the job: Craft-TwigTypeTest

Example:

{% set test_var = craft.entries %}

{% if test_var is of_type('object') %}
  true
{% endif %}

or

{% set test_var = craft.entries %}

{{ test_var|get_type }}
{# Outputs: object #}

Answer 2

To my knowledge this is not possible natively in Twig. Depending on your situation / template needs here are some useful tests

{% if foo is iterable %}

Array or object

{% if foo is same as(true) %}

Basically identical to using === in php

Answer 3

I recently needed to check if a variable is a number. My first idea was to use the divisibleby test:

{# DOESN'T WORK AS EXPECTED! #}
{% if var is divisible by(1) %}
{% endif %}

Unfurtunatelly twig returns true for every string passed to it.

But what you can do is to use regular expressions using the matches operator in the comparison. You'll note that I double escaped the dot and the meta-character \d, this is because of a twig bug (or put otherwise: wrong documentation of using regex here).

{# Match integer #}
{% if var matches '/^\\d+$/' %}
{% endif %}

{# Match floating point number #}
{% if var matches '/^[-+]?[0-9]*\\.?[0-9]+$/' %}
{% endif %}

Answer 4

I hit a snag for this where I needed to check if a value was a boolean type. This isn't the greatest approach, but it does work and is easy to interpret:

{% if value is same as(false) or value is same as(true) %}

Documentation: https://twig.symfony.com/doc/2.x/tests/sameas.html