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I want to use dump() in my .twig template (inside custom theme).

The problem is, when I place {{ dump() }} the page is just blank.

I have had:

  1. Set twig.confing debug: true in services.yml.
  2. Cleared cache.

The moment I remove {{ dump() }} everthing works.

After hours of googling I've found some information about mystery $settings['twig_debug'] = TRUE; here (I don't even have such line in my file, but adding it doesn't change a thing) and $twig = new Twig_Environment($loader, array(... (where to find it even?).

I work on clean & fresh Drupal 8 installation, turing debbuing on (step 1.) does include comments in source code (as it should) but use dump() once and all you see is just an blank page.

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  • Have you checked the drupal log? – Eyal Jun 19 '16 at 22:47
  • There is probably a PHP error associated with the blank screen. As far as I know, you want to go with Kint rather than dump() now. See drupaleasy.com/quicktips/… – cilefen Jun 20 '16 at 3:01
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    Blank screen means mostly memory error, and since dump() prints out all variables it could be a hint – Paul Bönisch Jun 20 '16 at 6:16
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I agree with the comment left for the question: It seems you have an out of memory issue. Check the error log for the server.

I had the same problem with dump() and kint() in an implementation of template_preprocess_views_view_field(), while trying to output the content of a row, on a clean and fresh Drupal 8 installation. I found a workaround for kint(), which seems to temporary fix the memory issue. Add the following settings in the config.default.php file for the Kint module.

/** @var int max array/object levels to go deep, if zero no limits are applied */
$_kintSettings['maxLevels'] = 4;

Take it as a hint: Print a specific variable, not the whole array of variables.

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  • It is also possible to only print the variable keys (though I forgot how). – Eyal Jun 20 '16 at 22:24
  • Thank you. Out of memory was the problem. Is there any maxLevels settings for dump() (something like $_kintSettings you provided for kint())? – PolGraphic Jun 22 '16 at 3:43
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    @Eyal I guess you were thinking about dump(_context|keys) – PolGraphic Jun 22 '16 at 3:44
  • Wasn't that. But if it works then it is fine as well. – Eyal Jun 22 '16 at 3:55
  • dump() uses $output = Variable::export($input) to output the variables array. It seems that there is no way to set how many level to go deep into array. – Oana Hulpoi Jun 22 '16 at 7:51

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