How do I put a block in a form?

My searches on this site and on google only have lead to questions of putting a form in a block. I want the opposite. I have a form definition array in a module, and I want to add in an existing block.

  • It would be difficult. In Drupal you only put blocks in regions, and regions are theme-dependent. Forms are module-dependent so it will be a lot of ugly hacks to do it that way. Do you have any actual problem you are facing, any use case that would require it? – Mołot May 8 '14 at 6:34
  • I have the form I want, except it's in a block. Instead of duplicating the code defining the form in another form, I would just like to put it right where I want it. – user1359 May 8 '14 at 13:38
  $block = module_invoke('module_name', 'block_view', 'block_id');

  $form['block'] = array(
    '#markup' => render($block),
  • Of course if form itself will end up in this block, it will cause beautiful case of WSOD. – Mołot May 12 '14 at 6:40
  • It's working out for me. – user1359 May 12 '14 at 17:28

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