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For some reason my theme function is not being found by Drupal. I swear I have followed everything and spent hours of time trying to make this work to no avail. Plus with not a single answer in the past 48 hours, Drupal's online support forum is about as much help as a bike with no wheels. Maybe some of you can figure out what is going wrong with this code.

    function opti_format_results($response) {

    $results = array(

    '#theme' => 'opti_design'

    );

    if ($response) {

    foreach ($response as $key => $value) {

    $results['result '.$key] = array(

    '#markup' => $response[$key]['title'],

    // '#link' => $response[$key]['link'],

    );

    }

    } else {

    $results[] = opti_nothing_found();

    }

    return $results;

    }


    function Opti_Search_theme() {

      return array(

    'opti_design' => array(

    'render element' => 'optisearch'

    )

      );

    }


    function theme_opti_design($variables) {

    $content = $variables['optisearch'];

    var_dump($variables);

    $content = "What is going on??";

    echo "IT HAS THEMED! :D";

    return $content;

    }

The error is quite simple. "Theme hook opti_design not found." Can someone please tell me what is wrong. Everything looks fine. The hook_theme() function was set properly, and worked in an entirely other module just fine but for whatever reason will not do it's job here. I feel like it is something simple but I am not seeing it. Thanks for any and all help.

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Your logic is fine, so check these:

  1. Your module is named 'Opti_Search". If not, Opti_Search_theme() needs to be changed to MODULENAME_theme(), and the caches cleared. This one seems most likely given the error message you received.
  2. You've cleared the caches since implementing hook_theme().
  3. The module is installed and enabled.
  • Thank you very much! Drupal does not seem to like capital letters in hook names. It must be all lower case otherwise it won't work. I changed Opti_Search to opti_search and it works fine now. It is strange, because the files are all Opti_Search, so is the info file but the actual script just doesn't like those capitals. Thanks again! :D – Eulerfan Jul 13 '14 at 22:03
  • @Eulerfan Yes, please review the Drupal coding standards for recommended best practice. Your coding style needs work. Also, if the answer works, you should mark it as "accepted" – David Thomas Jul 13 '14 at 23:04

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