Drupal - How do I get a block configuration value in a module?
You can load the block configuration entity, and get the settings.
$block = \Drupal\block\Entity\Block::load($block_id);
if ($block) {
$settings = $block->get('settings');
$my_text_field = $settings['my_text_field'];
}
$block_id
is the machine name you see in the block layout when you save the block.
Edit: Store module configuration
If you want to store configuration for modules don't use a block form, but use a configuration form. Reference https://www.drupal.org/docs/8/api/configuration-api/working-with-configuration-forms (see comment from @Berdir)
Dump all blocks and their settings
$blocks = \Drupal\block\Entity\Block::loadMultiple();
foreach ($blocks as $key => $block) {
$settings = $block->get('settings');
var_dump([$key => $settings]);
}
Replace BLOCK_ID
with your block's ID and dig the variables in it using get function
$config = \Drupal::config('block.block.BLOCK_ID');
$config->get('settings.my_text_field');