Drupal 7 – Create your own theme function on your custom block

More than a year ago, we have talked about some basic theming in Drupal 6.

In Drupal 7, there are some changes on the theming functions as well as the block hooks. So here is a slightly modified versions from the example of Drupal – Introduction to Drupal Theming @ 3. The logic behind is exactly the same.


; $Id$
name = Theme customized block
description = Theme the customized block. Ref: http://eureka.ykyuen.info
package = "Eureka"
core = 7.x
version = 7.x-1.0



 * Implementation of hook_block_info().
function ykyuen_block_info() {
  $blocks = array();
  $blocks['eureka_block'] = array(
    'info' => t('Eureka block')
  return $blocks;

 * Implements hook_block_view().
function ykyuen_block_view($delta = '') {
  $block = array();

  switch ($delta) {
    case 'eureka_block':
      $variables = array(
        'name' => 'Welcome to Eureka!',
        'link' => 'http://eureka.ykyuen.info',
      $block = array('content' => theme('eureka', $variables));

  return $block;

 * Implementation of hook_theme().
function ykyuen_theme() {
  return array(
    'eureka' => array(
      'template' => 'eureka',
      'variables' => array(
        'name' => NULL,
        'link' => NULL,

 * Preprocess function for eureka.tpl.php.
function ykyuen_preprocess_eureka(&$variables) {
  $variables['extra'] = "Hello World!";


<h2>Theme .tpl.php example</h2>
<p><a href="<?php print $link; ?>"><?php print $name; ?></a></p>
<p><?php print $extra; ?></p>

Enable the module and turn on Eureka block. Remember to clear the cache before viewing you first themed block.
Done =)


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