Undefined Twig Filter

Question

I'm using Twig in a standalone PHP app. So my composer only has this requirement: "twig/twig": "^3.6".

I initialize twig, and then add custom filter like so:

$loader = new \Twig\Loader\FilesystemLoader('templates');
$twig = new \Twig\Environment($loader, [
    'cache' => 'tmp/cache',
]);

$twig->addFilter(new \Twig\TwigFilter('rot13', function ($string) {
    return str_rot13($string);
}));

In my templates, I always get Unknown Filter error whenever I try to use the filter in {{ 'MYNAME' | rot13 }}

Also tried with Function, but getting similar Unknown Function error.

Am I missing something?

This is the error on the page:

Unknown "rot13" filter. [/myfiles/templates/tester.html:26]

[vendor/twig/twig/src/ExpressionParser.php:562] Twig\ExpressionParser->getFilterNodeClass('rot13',26)
[vendor/twig/twig/src/ExpressionParser.php:547] Twig\ExpressionParser->parseFilterExpressionRaw(TwigNodeExpressionConstantExpression::__set_state([]))
[vendor/twig/twig/src/ExpressionParser.php:405] Twig\ExpressionParser->parseFilterExpression(TwigNodeExpressionConstantExpression::__set_state([]))
[vendor/twig/twig/src/ExpressionParser.php:288] Twig\ExpressionParser->parsePostfixExpression(TwigNodeExpressionConstantExpression::__set_state([]))
[vendor/twig/twig/src/ExpressionParser.php:177] Twig\ExpressionParser->parsePrimaryExpression()
[vendor/twig/twig/src/ExpressionParser.php:72] Twig\ExpressionParser->getPrimary()
[vendor/twig/twig/src/Parser.php:127] Twig\ExpressionParser->parseExpression()
[vendor/twig/twig/src/TokenParser/ForTokenParser.php:42] Twig\Parser->subparse([TwigTokenParserForTokenParser::__set_state([]),'decideForFork'])
[vendor/twig/twig/src/Parser.php:170] Twig\TokenParser\ForTokenParser->parse(TwigToken::__set_state([]))
[vendor/twig/twig/src/TokenParser/BlockTokenParser.php:47] Twig\Parser->subparse([TwigTokenParserBlockTokenParser::__set_state([]),'decideBlockEnd'],true)
[vendor/twig/twig/src/Parser.php:170] Twig\TokenParser\BlockTokenParser->parse(TwigToken::__set_state([]))
[vendor/twig/twig/src/Parser.php:83] Twig\Parser->subparse(NULL,false)
[vendor/twig/twig/src/Environment.php:491] Twig\Parser->parse(TwigTokenStream::__set_state([]))
[vendor/twig/twig/src/Environment.php:519] Twig\Environment->parse(TwigTokenStream::__set_state([]))
[vendor/twig/twig/src/Environment.php:351] Twig\Environment->compileSource(TwigSource::__set_state([]))
[vendor/twig/twig/src/Environment.php:312] Twig\Environment->loadTemplate('__TwigTemplate_9fcd4d27f601c5dddfd436979e4446b0','admin/classlist.html')

FIxed code. I had a use \Twig|twigFilter at the top. And the Error does say Unknown "rot13" filter. — Ayman
– Ayman, Commented Jun 13, 2023 at 11:21
How are you rendering the template? With the current posted code I'm not able to reproduce the error - demo — DarkBee
– DarkBee, Commented Jun 13, 2023 at 12:05
In the template, as I mentioned I have {{ 'STRING' | rot13 }}. To ensure my syntax is correct, I checked for {{ 'STRING' | lower }} and this correctly produces 'string'. — Ayman
– Ayman, Commented Jun 13, 2023 at 12:23
Yes, but how are you rendering the template? Are you using $twig->render(...)? — DarkBee
– DarkBee, Commented Jun 13, 2023 at 12:25
DOH!!! That is EXACTLY the right question :-). I had TWO places where $twig was used. and I incorrectly added the filter to the wrong one. Cl;aned up now. — Ayman
– Ayman, Commented Jun 13, 2023 at 12:33

Ayman · Accepted Answer · 2023-06-13 12:38:15Z

0

User error. There were two $twig instances, filters were added to one instance and rendered using the other one. Thanks to @DarkBee for asking the right question :-)

answered Jun 13, 2023 at 12:38

Ayman

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MadCatERZ · Accepted Answer · 2023-06-13 11:19:44Z

-1

Try

$twig->addFilter(new \Twig\TwigFilter('rot13', function ($string) {
    return str_rot13($string);
}));

Maybe he's just not able to resolve the class path. Works in my environment

answered Jun 13, 2023 at 11:19

MadCatERZ

2009 bronze badges

2 Comments

Ayman Over a year ago

Tried this one too, still Unknown "rot13" filter

DarkBee Over a year ago

If this were true then OP would get an entirely different error e.g. Fatal error: Class "xxxxx" not found

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