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I have registered a custom block with ACFs acf_register_block. I have set a render_callback to load a php template but would like to access any extra CSS classes which the user may have set in the admin.

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Does WordPress provide a global like $block (similar to $post) or would I need to raise a question on the ACF support forums?

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Note that I don't have ACF PRO 5.8 which comes with the Block features, but I hope this answer helps.

If you look at the example here, you can retrieve the additional/custom CSS classes using props.attributes.className; i.e. the classes are saved as an attribute named className.

So with that in mind and based on acf_register_block() (which as of writing, it redirects to acf_register_block_type()), your render_callback function would receive a $block array (the block settings and attributes) as the first argument, and therefore you should be able to retrieve the additional CSS class(es) via $block['className'] as shown here — see the example under "Registering a block with callback".

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    Perfect, thank you. I don't know why I didn't just try a var_dump($block) as I said in my own question!
    – Alexander Holsgrove
    May 9, 2019 at 8:18
  • I don't know, either.. :) But anyway, I'm glad I could help.
    – Sally CJ
    May 9, 2019 at 18:26

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