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Lesson20 drupal7模块开发1---入门篇，制作一个节点列表区
 current_posts.info
 
name = Current Posts
description = A block module that lists links to recent posts.
core = 7.x

--------------

current_posts.module

<?php
/**
 * Implements hook_help().
 *
 * Displays help and module information.
 *
 * @param path
 *   Which path of the site we're using to display help
 * @param arg
 *   Array that holds the current path as returned from arg() function
 */
function current_posts_help($path, $arg) {
  switch ($path) {
    case "admin/help#current_posts":
      return '<p>' . t("Displays links to nodes created on this date") . '</p>';
      break;
  }
}

/**
 * Implements hook_block_info().
 */
function current_posts_block_info() {
  $blocks['current_posts'] = array(
    // The name that will appear in the block list.
    'info' => t('Current posts'),
    // Default setting.
    'cache' => DRUPAL_CACHE_PER_ROLE,
  );
  return $blocks;
}

/**
 * Custom content function.
 *
 * Set beginning and end dates, retrieve posts from database
 * saved in that time period.
 *
 * @return
 *   A result set of the targeted posts.
 */
function current_posts_contents(){
  //Get today's date.
  $today = getdate();
  //Calculate the date a week ago.
  $start_time = mktime(0, 0, 0,$today['mon'],($today['mday'] - 7), $today['year']);
  //Get all posts from one week ago to the present.
  $end_time = time();
  //Use Database API to retrieve current posts.
  $query = db_select('node', 'n')
    ->fields('n', array('nid', 'title', 'created'))
    ->condition('status', 1) //Published.
    ->condition('created', array($start_time, $end_time), 'BETWEEN')
     ->condition('type', 'article') //type.
    ->orderBy('created', 'DESC') //Most recent first.
    ->execute();
  return $query;
}

/**
 * Implements hook_block_view().
 *
 * Prepares the contents of the block.
 */
function current_posts_block_view($delta = '') {
  switch ($delta) {
    case 'current_posts':
      $block['subject'] = t('Current posts');
      if (user_access('access content')) {
        // Use our custom function to retrieve data.
        $result = current_posts_contents();
        // Array to contain items for the block to render.
        $items = array();
        // Iterate over the resultset and format as links.
        foreach ($result as $node) {
          $items[] = array(
            'data' => l($node->title, 'node/' . $node->nid),
          );
        }
       // No content in the last week.
        if (empty($items)) {
          $block['content'] = t('No posts available.');
        }
        else {
          // Pass data through theme function.
          $block['content'] = theme('item_list', array(
            'items' => $items));
        }
      }
    return $block;
  }
}

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