142

It seem I have problem with a twig if statement.

{%if fields | length > 0 || trans_fields | length > 0 -%}

The error is:

Unexpected token "punctuation" of value "|" ("name" expected) in

I can't understand why this doesn't work, it's like if twig was lost with all the pipes.

I've tried this :

{% set count1 = fields | length %}
{% set count2 = trans_fields | length %}
{%if count1 > 0 || count2 > 0 -%}

but the if also fail.

Then tried this:

{% set count1 = fields | length > 0 %}
{% set count2 = trans_fields | length > 0 %}
{%if count1 || count2 -%}

And it still doesn't work, same error every time ...

So... that lead me to a really simple question: does Twig support multiple conditions IF ?

dreftymac
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FMaz008
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2 Answers2

324

If I recall correctly Twig doesn't support || and && operators, but requires or and and to be used respectively. I'd also use parentheses to denote the two statements more clearly although this isn't technically a requirement.

{%if ( fields | length > 0 ) or ( trans_fields | length > 0 ) %}

Expressions

Expressions can be used in {% blocks %} and ${ expressions }.

Operator    Description
==          Does the left expression equal the right expression?
+           Convert both arguments into a number and add them.
-           Convert both arguments into a number and substract them.
*           Convert both arguments into a number and multiply them.
/           Convert both arguments into a number and divide them.
%           Convert both arguments into a number and calculate the rest of the integer division.
~           Convert both arguments into a string and concatenate them.
or          True if the left or the right expression is true.
and         True if the left and the right expression is true.
not         Negate the expression.

For more complex operations, it may be best to wrap individual expressions in parentheses to avoid confusion:

{% if (foo and bar) or (fizz and (foo + bar == 3)) %}
JacobTheDev
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Ben Swinburne
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    And of course I had no chance of finding that wonderful and time-saving table when looking at the IF documentation : http://twig.sensiolabs.org/doc/tags/if.html Thanks for the solution ! – FMaz008 Dec 05 '11 at 17:01
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    They tend to use the wiki on github to more thoroughly document their code. That table comes from [here](https://github.com/vito/chyrp/wiki/Twig-Reference) – Ben Swinburne Dec 05 '11 at 18:26
  • Using != didn't seem to work for me (may be a bug?): {% if (key != 'string1') or (key != 'string2') or (key != 'string3') %} so I had to use (key == 'stringN') for all of them and put what I needed in the 'else' statement – timhc22 Apr 16 '14 at 09:31
  • You need to use the `not` operator to negate the expression. – Ben Swinburne Apr 16 '14 at 09:37
  • I was confused by the author's definition of '%'. As in PHP, '%' is for mod (modulus division)/calculating the remainder. If you want integer division, use '//' – James Palawaga Aug 27 '14 at 17:54
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    you forgot the ternary operator `?` – john Smith Jul 18 '15 at 21:25
  • It may be noteworthy - twig allows only lowercase `and` and `or`, so `AND` and `OR` won't work. Since it shows up error that googling out brings here, I think it's worth mentioning. – Gall Annonim Apr 15 '21 at 11:57
  • Twig 2 documentation on if condition: https://twig.symfony.com/doc/2.x/tags/if.html – farnoosh Jan 27 '22 at 16:19
3

Using != for multiple conditions does not work for me either, however == does work - indeed this seems like a bug.

Possible work around.

{% if key not in ['string1', 'string2'] %}
// print something
{% endif %}
delmarr
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