How to List Categories along with Their Posts

To help site visitor finding one or two categories, We can use default widget or wp_list_categories to list the categories. In some case, We want to display the categories along with their posts. Unfortunately, this default widget and function can’t perform that. But this snippet can. Read more : http://www.dynamicwp.net/articles-and-tutorials/how-to-list-categories-along-with-their-posts/

PHP

Put the code in sidebar, page template or wherever You want to display the categories

<?php
//get all categories then display all posts in each term
$taxonomy = 'category';
$param_type = 'category__in';
$term_args=array(
  'orderby' => 'name',
  'order' => 'ASC'
);
$terms = get_terms($taxonomy,$term_args);
if ($terms) {
  foreach( $terms as $term ) {
    $args=array(
      "$param_type" => array($term->term_id),
      'post_type' => 'post',
      'post_status' => 'publish',
      'posts_per_page' => -1,
      'caller_get_posts'=> 1
      );
    $my_query = null;
    $my_query = new WP_Query($args);
    if( $my_query->have_posts() ) {  ?>
      <div class="category section">
	    <h3><?php echo 'Category '.$term->name;?></h3>
	    <ul>
	    <?php
      while ($my_query->have_posts()) : $my_query->the_post(); ?>
        <li><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></li>
       <?php
      endwhile;
      ?>
      </ul>
      </div>
 <?php
    }
  }
}
wp_reset_query();  // Restore global post data stomped by the_post().
?>