Is in_array or similar possible within an if statement?

Question

I am using Twig as a templating engine. However, I ran in a situation which definitely must be 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 }} does not 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 }} does not 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?

CPPUIX · Accepted Answer · 2024-02-02 20:55:08Z

539

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

{% if myVar is in_array(array_keys(someOtherArray)) %} # or {% if myVar in someOtherArray|keys %}

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

edited Feb 2, 2024 at 20:55

CPPUIX

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answered Sep 18, 2011 at 9:25

Raffael

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4 Comments

Burgi Over a year ago

If you want to achieve the same as in_array() in PHP, ommit the keys filter

insertusernamehere Over a year ago

+ 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 %}.

tight Over a year ago

You can also use defined : {% if someOtherArray.myVar is defined %} (twig.sensiolabs.org/doc/tests/defined.html)

7ochem Over a year ago

Here's a Twig fiddle to play with of the complete solution based upon the OP's code and the code in this answer: twigfiddle.com/0b5crp

CPPUIX · Accepted Answer · 2024-02-02 20:52:46Z

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

To do the same as PHP in_array, use the following expression:

{% if myVar in myArray %}

If you want to negate this, you should use this:

{% if myVar not in myArray %}

Samuel RIGAUD · Accepted Answer · 2024-02-02 23:06:11Z

52

Try this:

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

edited Feb 2, 2024 at 23:06

Samuel RIGAUD

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answered Feb 18, 2019 at 9:30

AVe

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Comments

Samuel RIGAUD · Accepted Answer · 2024-02-02 20:48:21Z

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 %}

sh6210 · Accepted Answer · 2024-02-10 17:32:28Z

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

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

If someone needs to work through foreach, then:

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

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.

CPPUIX · Accepted Answer · 2024-02-02 21:03:42Z

3

{% 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

edited Feb 2, 2024 at 21:03

CPPUIX

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answered Jul 12, 2016 at 13:30

FDisk

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1 Comment

Maxim Mandrik Over a year ago

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). twig.symfony.com/doc/2.x/deprecated.html#tags

CPPUIX · Accepted Answer · 2024-02-02 20:56:33Z

2

The below, without keys, helps me.

{% if myVar in myArray %}

edited Feb 2, 2024 at 20:56

CPPUIX

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answered Nov 26, 2022 at 22:44

Al Kativo

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1 Comment

Hayden Thring Over a year ago

yep, or even {% if 5 in [3,5] %}

7ochem · Accepted Answer · 2021-05-28 10:27:56Z

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

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