Drupal 7 Module Development: Content callback in block

espn_news.module

<?php
 
  /**
   * Implements hook_block_view().
   *
   * Creates content for our block. It sets the title for the block, and returns
   * our news (from our custom callback) as a ul-list, with the id 'espn-news'.
   *
   * @url: https://api.drupal.org/api/drupal/modules!block!block.api.php/function/hook_block_view/7
   */
  function espn_news_block_view($delta = '') {
    $block = array();
 
    switch ($delta) {
      case 'espn_news':
        // List attributes.
        $attributes = array(
          'id' => 'espn_news',
        );

        // Set block title.
        $block['subject'] = t('ESPN News');

        // Get content from API.
        $items = espn_news_api_content();

        // Print list.
        $block['content'] = theme('item_list', array(
          'items' => $items,
          'type' => 'ul',
          'attributes' => array(
            'id' => 'espn-news',
          ),
        ));

    }
 
    return $block;
  }