Create a custom block programmatically and specify region and pages on which created block must shown on

Question

For create block programmatically I use

$block = BlockContent::create([
  'info' => 'block 3',
  'type' => 'basic',
  'langcode' => 'en',
  'body' => [
    'value' => '<h1>Block's body</h1>',
    'format' => 'full_html',
  ],
]);
$block->save();

It works good enough but is it possible also to specify region and then on which pages created block must shown on?

Answer 1

You have to create a block config entity to place a block:

use Drupal\block\Entity\Block;

  $placed_block = Block::create([
    'id' => 'block_machine_name',
    'theme' => 'classy',
    'weight' => 0,
    'status' => TRUE,
    'region' => 'footer',
    'plugin' => 'block_content:' . $block->uuid(),
    'settings' => [],
    'visibility' => [
      'request_path' => [
        'id' => 'request_path',
        'negate' => FALSE,
        'pages' => '/path',
      ],
    ],
  ]);
  $placed_block->save();

Answer 2

OK, at least I managed to solve this problem.

Below the full code that create block and then bind it to region and also set pages on which created block must shown on. Maybe it can helps anyone.

 $block = BlockContent::create([
         'info' => 'block242',
         'type' => 'basic',
         'langcode' => 'en',
         'body' => [

          'value' => '<h1>Block's body</h1>',
            'format' => 'full_html',
           ],
          ]);


     $block->save();


       $placed_block = Block::create([
         'id' => 'block242',
            'theme' => 'scholarly',
'weight' => -7,
'status' => TRUE,
'region' => 'sidebar_second',
'plugin' => 'block_content:' . $block->uuid(),
'settings' => [],
'visibility' => [
  'request_path' => [
    'id' => 'request_path',
    'negate' => FALSE,
    'pages' => '/your_page',
  ],
],
        ]);
    $placed_block->save();  

And of course, very very BIG thanks to user 4k4. Without his help I'd never do this.