Display WordPress categories - add to functions.php

Display WordPress categories

class DisplayCategoriesWidget extends WP_Widget
{
  function DisplayCategoriesWidget()
  {
    $widget_ops = array('classname' => 'DisplayCategoriesWidget', 'description' => 'Displays categories' );
    $this->WP_Widget('DisplayCategoriesWidget', 'Display Categories Widget', $widget_ops);
  }
 
  function form($instance)
  {
    $instance = wp_parse_args( (array) $instance, array( 'title' => '','cat_id' => '' ) );
    $title = $instance['title'];
    $category = $instance['category'];
    $dcw_limit = $instance['dcw_limit'];
    $display_parent = $instance['display_parent'];
    $display_empty_categories = $instance['display_empty_categories'];
    $showcount_value = $instance['showcount_value'];
    

	   // Get the existing categories and build a simple select dropdown for the user.
		$categories = get_categories(array( 'hide_empty' => 0));
 
		$cat_options = array();
		$cat_options[] = '<option value="BLANK">Select one...</option>';
		foreach ($categories as $cat) {
			$selected = $category === $cat->cat_ID ? ' selected="selected"' : '';
			$cat_options[] = '<option value="' . $cat->cat_ID .'"' . $selected . '>' . $cat->name . '</option>';
		}

?>
  <p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?> <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo attribute_escape($title); ?>" /></label></p>
  <!--<p><label for="<?php echo $this->get_field_id('cat_id'); ?>">Category id: <input class="widefat" id="<?php echo $this->get_field_id('cat_id'); ?>" name="<?php echo $this->get_field_name('cat_id'); ?>" type="text" value="<?php echo attribute_escape($cat_id); ?>" /></label></p>-->

<p>
				<label for="<?php echo $this->get_field_id('category'); ?>">
					<?php _e('Choose category (optional):'); ?>
				</label>
				<select id="<?php echo $this->get_field_id('category'); ?>" class="widefat" name="<?php echo $this->get_field_name('category'); ?>">
					<?php echo implode('', $cat_options); ?>
				</select>
			</p>
<p><label for="<?php echo $this->get_field_id('dcw_limit'); ?>"><?php _e('Limit (optional):'); ?> <input class="widefat" id="<?php echo $this->get_field_id('dcw_limit'); ?>" name="<?php echo $this->get_field_name('dcw_limit'); ?>" type="text" value="<?php echo attribute_escape($dcw_limit); ?>" /></label></p>
<p><?php _e('Display Parent? (optional):'); ?> <br><input name="<?php echo $this->get_field_name('display_parent'); ?>" type="radio" value="1" <?php if(attribute_escape($display_parent)==1) echo "checked"; ?> />Yes &nbsp; <input name="<?php echo $this->get_field_name('display_parent'); ?>" type="radio" value="0"  <?php if(attribute_escape($display_parent)==0) echo "checked"; ?>/>No </p>
<br>
<p><?php _e('Display Empty categories? (optional):'); ?> <br><input name="<?php echo $this->get_field_name('display_empty_categories'); ?>" type="radio" value="0" <?php if(attribute_escape($display_empty_categories)==0) echo "checked"; ?> />Yes &nbsp; <input name="<?php echo $this->get_field_name('display_empty_categories'); ?>" type="radio" value="1"  <?php if(attribute_escape($display_empty_categories)==1) echo "checked"; ?>/>No </p>
<p><?php _e('Display Number of posts near categories? (optional):'); ?> <br><input name="<?php echo $this->get_field_name('showcount_value'); ?>" type="radio" value="1" <?php if(attribute_escape($showcount_value)==1) echo "checked"; ?> />Yes &nbsp; <input name="<?php echo $this->get_field_name('showcount_value'); ?>" type="radio" value="0"  <?php if(attribute_escape($showcount_value)==0) echo "checked"; ?>/>No </p>
  

  <?php
  }
 
  function update($new_instance, $old_instance)
  {
    $instance = $old_instance;
    $instance['title'] = $new_instance['title'];
    $instance['category'] = $new_instance['category'];
    $instance['dcw_limit'] = $new_instance['dcw_limit'];
    $instance['display_parent'] = $new_instance['display_parent'];
    $instance['display_empty_categories'] = $new_instance['display_empty_categories'];
    $instance['showcount_value'] = $new_instance['showcount_value'];
    
    
    return $instance;
  }
 
  function widget($args, $instance)
  {
    extract($args, EXTR_SKIP);
 
    echo $before_widget;
    $title = empty($instance['title']) ? ' ' : apply_filters('widget_title', $instance['title']);
    $cat_id = $instance['category'];
    $dcw_limit = $instance['dcw_limit'];
    $display_empty_categories = $instance['display_empty_categories'];
    $showcount_value = $instance['showcount_value'];
    
 
    if (!empty($title))
      echo $before_title . $title . $after_title;;
    if($instance['display_parent']==1) 
      {
        $yourcat= get_category($cat_id);
        if ($yourcat) echo '<h2>' . $yourcat->name . '</h2>';
      }
	echo "<ul>"; 
	wp_list_categories('orderby=name&show_count='.$showcount_value.'&child_of='.$cat_id.'&hide_empty='.$display_empty_categories.'&title_li=&number='.$dcw_limit);
	echo "</ul>";
 
    echo $after_widget;
  }
 
}
add_action( 'widgets_init', create_function('', 'return register_widget("DisplayCategoriesWidget");') );