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In theme_preprocess functions (e.g. theme_preprocess_block, theme_preprocess_menu, etc) there is the $variables argument.

In Drupal 7 I could look at this variable using devel module and typing dpm($variables).

How I can do that in Drupal 8?

I tried kint, dump and var_dump, but for all of them I get a fatal error memory exhausted.

  • If there's not enough memory for var_dump, PHP (or your server) might just need more memory. If that's impossible there are some creative workarounds here: stackoverflow.com/questions/5446647/…. Limiting the output level via xdebug might be the easiest – Clive Mar 5 '18 at 20:53
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The best way would probably be a breakpoint with xdebug turned on. Which requires configuration efforts though.

What I was normally doing in similar cases was a step-by-step approach. I was printing out $variables keys first and then narrowing my var_dump with a specific key. E.g. var_dump($variables['key']). Slowly but surely.

In the end I think that in terms of efforts it is way better to set up debugger and use breakpoints to inspect variables.

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Best approach for this is to use print step by step. Use echo ''; var_dump($variables); This will fetch the result in readable format.

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