When implementing Views in websites, you might come across situation when you cannot find the proper field to display the data. Finally we end up using a php field for displaying the data. Use of php field will always affect the caching of the views. To avoid this we can replace this with the a custom field. To implement the same please continue reading. Add hook_views_api() to register a views api.

/**
 * Implements hook_views_api().
 */
function MY_MODULE_NAME_views_api() {
  return array(
    'api' => 3,
    'path' => drupal_get_path('module', 'MY_MODULE_NAME') . '/views',
  );
}

Add hook_views_data() for registering the new field. The handler mentioned in this module is a new file which will define the functioning of the new field.

/**
 * Implements hook_views_data().
 */
function MY_MODULE_NAME_views_data() {
  $data['node']['custom_field_name'] = array(
    'title' => t('Custom field title'),
    'help' => t('Custom field description'),
    'field' => array(
      'handler' => 'MY_MODULE_NAME_handler_field_custom_field_name',
    ),
  );
  return $data;
}

Add a new file in the "views" folder in modules root folder with the name "MY_MODULE_NAME_handler_field_custom_field_name". Add the below contents to the new file and change the render function according to your logic.

additional_fields['type'] = 'type';
    $this->additional_fields['nid'] = 'nid';
  }

  /**
   * Called to add the field to a query.
   */
  function query() {
    $this->ensure_my_table();
    $this->add_additional_fields();
  }

  /**
   * Render the field.
   *
   * @param $values
   *   The values retrieved from the database.
   */
  function render($values) {
    $type = $this->get_value($values, 'type');
    $nid = $this->get_value($values, 'nid');
    return 'node' . $nid . '/' . $type;
  }
}

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