Twig: in_array or similar possible within if statement?

Question

I am using Twig as templating engine and I am really loving it. However, now I have run in a situation which definitely mustbe accomplishable in a simpler way than I have found.

What I have right now is this:

{% for myVar in someArray %}    
    {% set found = 0 %}
    {% for id, data in someOtherArray %}
        {% if id == myVar %}
            {{ myVar }} exists within someOtherArray.
            {% set found = 1 %} 
        {% endif %}
    {% endfor %}

    {% if found == 0 %}
        {{ myVar }} doesn't exist within someOtherArray.
    {% endif %}
{% endfor %}

What I am looking for is something more like this:

{% for myVar in someArray %}    
    {% if myVar is in_array(array_keys(someOtherArray)) %}
       {{ myVar }} exists within someOtherArray.
    {% else %}
       {{ myVar }} doesn't exist within someOtherArray.
    {% endif %}
{% endfor %}

Is there a way to accomplish this which I haven't seen yet?

If I need to create my own extension, how can I access myVar within the test function?

Thanks for your help!

Яaffael1984 has the right answer. But what you are trying to do should be done in the controller, not in the view! Format your array and then give a clean thing to the view for the best readability. — Vivien, Oct 05 '12 at 13:59
I suppose it really depends on the context which way makes more sense, don't you think? — sprain, Oct 05 '12 at 15:00

score 529 · Accepted Answer · edited Dec 09 '22 at 22:28

529

You just have to change the second line of your second code-block from

{% if myVar is in_array(array_keys(someOtherArray)) %}

to

{% if myVar in someOtherArray|keys %}

in is the containment-operator and keys a filter that returns an arrays keys.

edited Dec 09 '22 at 22:28

Manuel

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answered Sep 18 '11 at 09:25

Raffael

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123

If you want to achieve the same as in_array() in PHP, ommit the keys filter – Burgi Feb 08 '12 at 16:05
28

+ 1 And also the negation is `{% if item not in array %}` and not `{% if not _entry.id in array %}`, so it's different from this `{% if not var is null %}`. – insertusernamehere Dec 18 '12 at 11:23
9

You can also use defined : `{% if someOtherArray.myVar is defined %}` (http://twig.sensiolabs.org/doc/tests/defined.html) – tight Jun 15 '14 at 18:01
Here's a Twig fiddle to play with of the complete solution based upon the OP's code and the code in this answer: https://twigfiddle.com/0b5crp – 7ochem May 28 '21 at 10:14

score 138 · Answer 2 · answered May 05 '16 at 09:45

138

Just to clear some things up here. The answer that was accepted does not do the same as PHP in_array.

To do the same as PHP in_array use following expression:

{% if myVar in myArray %}

If you want to negate this you should use this:

{% if myVar not in myArray %}

answered May 05 '16 at 09:45

Wim Mostmans

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These two points seem to have been covered by the comments on the accepted answer back in 2012. This answer doesn't seem to add anything extra. – William Isted Aug 18 '16 at 14:43
10

@William Isted this answer adds the right way to do PHP's `in_array()` in twig. – elvismdev Apr 08 '17 at 07:06
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@WilliamIsted Then that accepted answer should be edited to be correct. – user1032531 May 05 '18 at 13:34
6

It's better that answers given in comments be turned into actual answers, as comments are much more likely to be deleted. – Nathan Arthur Jun 22 '18 at 13:34
^-- deleted or simply ignored – Cid Oct 15 '19 at 09:15

score 43 · Answer 3 · answered Feb 18 '19 at 09:30

43

Try this

{% if var in ['foo', 'bar', 'beer'] %}
    ...
{% endif %}

answered Feb 18 '19 at 09:30

Arthur Veselov

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score 11 · Answer 4 · edited Aug 18 '16 at 14:52

11

another example following @jake stayman:

{% for key, item in row.divs %}
    {% if (key not in [1,2,9]) %} // eliminate element 1,2,9
        <li>{{ item }}</li>
    {% endif %}
{% endfor %}

edited Aug 18 '16 at 14:52

William Isted

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answered May 23 '16 at 15:11

Dung

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score 5 · Answer 5 · answered Oct 02 '19 at 05:28

5

Though The above answers are right, I found something more user-friendly approach while using ternary operator.

{{ attachment in item['Attachments'][0] ? 'y' : 'n' }}

If someone need to work through foreach then,

{% for attachment in attachments %}
    {{ attachment in item['Attachments'][0] ? 'y' : 'n' }}
{% endfor %}

answered Oct 02 '19 at 05:28

sh6210

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Don't know why this answer gets no upvotes. While this one-liner is the smallest and perfect code you can have nowadays. For example using `{{ item.value in cfg.static_site ? ' checked="checked"' : '' }}` in a for loop (checking if a specific item exists in that array) will check that item. – OSWorX Nov 29 '20 at 08:40
@OSWorX agree :) – Meow Kim Oct 15 '21 at 10:20
Thank you OSWorX, Meow Kim – sh6210 Oct 15 '21 at 11:27

score 3 · Answer 6 · answered Jul 12 '16 at 13:30

3

It should help you.

{% for user in users if user.active and user.id not 1 %}
   {{ user.name }}
{% endfor %}

More info: http://twig.sensiolabs.org/doc/tags/for.html

answered Jul 12 '16 at 13:30

FDisk

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Adding an if condition on a for tag is deprecated in Twig 2.10. Use a filter filter or an “if” condition inside the “for” body instead (if your condition depends on a variable updated inside the loop). https://twig.symfony.com/doc/2.x/deprecated.html#tags – Maxim Mandrik Jan 12 '21 at 14:24

score 1 · Answer 7 · answered Nov 26 '22 at 22:44

1

{% if myVar in myArray %} without keys helps me

answered Nov 26 '22 at 22:44

Al Kativo

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yep, or even {% if 5 in [3,5] %} – Hayden Thring Jul 21 '23 at 06:28

score 0 · Answer 8 · answered May 28 '21 at 10:27

Here's one to complete the answers with all the possibilities of Twig these days:

To achieve something like this:

{% for myVar in someArray %}    
    {% if myVar in someOtherArray|keys %}
       {{ myVar }} exists within someOtherArray.
    {% else %}
       {{ myVar }} doesn't exist within someOtherArray.
    {% endif %}
{% endfor %}

^{(https://twigfiddle.com/0b5crp)}

You could also use array mapping and have the following one-liner:
^{(Twig >= 1.41 or >= 2.10 or any 3.x version)}

{{ someArray|map(myVar => myVar ~ (myVar not in someOtherArray|keys ? ' doesn\'t') ~ ' exists within someOtherArray.')|join('\n') }}

Which outputs something quite similar.

Also see this Twig fiddle: https://twigfiddle.com/dlxj9g

Twig: in_array or similar possible within if statement?

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