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I have created a view in a block, to display some related information to the current content type being displayed into the block. More precisely, I want to display the block only for book pages.

What I did is to add a contextual filter based on content type. For "WHEN THE FILTER VALUE IS NOT AVAILABLE", I provide a default value for "PHP contextual filter code" as follows

$node = node_load(arg(1));
return $node->type;

For "WHEN THE FILTER VALUE IS AVAILABLE", I use "Specify validation criteria" for content types with "book page".

I tried this but it didn't work. I think because I am using aliases in the url, it does not work.

What am I missing?

P.S: My final goal is actually to extract the group audience from the current book page and display the admins of that group into the block.

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In your case you don't need to provide any default value with PHP code.

Remove your contextual filter and add new one: Content: nid.

"WHEN THE FILTER VALUE IS NOT AVAILABLE"

Provide default value -> content ID from URL

"When the filter value IS available or a default is provided"

Specify validation criteria

Validator -> Content -> book

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Why are you checking the content type with the view?

If I understood your question, you want to display the view's block only on certain content type ('Book'). A much easier solution will be:

  1. Go to Dashboard >> Structure >> Blocks
  2. Find the view's block and go to its configuration
  3. Under the 'Content Types' tab add 'Book'

That is it!

Block configuration page

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