I am working on a custom slider programmatically. I create a custom module (block_example) and make a block (BlockExample.php) and a twig file (blockexample.html.twig) and also a module file (block_example.module). I want to place some code in twig file and call it in block file.

This is build function from block file (BlockExample.php)

public function build() {

  $renderable = [
    '#theme' => 'blockexample',

  return $renderable;

This is (blockexample.html.twig) file code

<div class="col-sm-3">
  <h1>This is Title</h1>
  <p>Description Coming From Twig File</p>

This is (block_example.module) file code

function block_example_theme() {
  return [
    'block_example' => [
      'variables' => ['test_var' => NULL],

Now main question is how to print twig file in BlockExample.php

  • Why do you want print twig file in BlockExample.php? It's not follow of drupal. In file BlockExample.php you already return a render array, so when you add block in theme content in blockexample.html.twig will be display.
    – Jonh
    Commented Jan 27, 2021 at 6:49
  • @Jonh – This is totally Drupal. Why build complex markup in a plugin's build function when you can pass all variables to a template and later have others be able to override the markup from their theme?
    – leymannx
    Commented Jan 27, 2021 at 10:39
  • Muhammad, look: '#theme' => 'blockexample', and return ['block_example' => [. Do you see the difference? One comes with an underscore, and one doesn't. Fix the typo, flush caches a thousand times and tell us if it's working now.
    – leymannx
    Commented Jan 27, 2021 at 10:45

1 Answer 1


The theme key you use in you build funtions should be the same with the one you are using in your hook_theme.

In that case you code should look like so

public function build() {

  $renderable = [
    '#theme' => 'block_example',

  return $renderable;

Keep in mind to avoid dashes in those values, since they are used for the template naming.

Best regards.

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