Code for Recent Posts Widget

2 comments

1. The default Recent Posts Widget code is in includes/default-widgets.php but you should not be hacking Core code. Copy that function to your theme’s functions.php, rename it, and create your own customized widget.

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2. Have a look in wp-includesdefault-widgets.php.

   /**
    * Recent_Posts widget class
    *
    * @since 2.8.0
    */
   class WP_Widget_Recent_Posts extends WP_Widget {
   
       function __construct() {
           $widget_ops = array('classname' => 'widget_recent_entries', 'description' => __( "The most recent posts on your site") );
           parent::__construct('recent-posts', __('Recent Posts'), $widget_ops);
           $this->alt_option_name = 'widget_recent_entries';
   
           add_action( 'save_post', array($this, 'flush_widget_cache') );
           add_action( 'deleted_post', array($this, 'flush_widget_cache') );
           add_action( 'switch_theme', array($this, 'flush_widget_cache') );
       }
   
       function widget($args, $instance) {
           $cache = wp_cache_get('widget_recent_posts', 'widget');
   
           if ( !is_array($cache) )
               $cache = array();
   
           if ( ! isset( $args['widget_id'] ) )
               $args['widget_id'] = $this->id;
   
           if ( isset( $cache[ $args['widget_id'] ] ) ) {
               echo $cache[ $args['widget_id'] ];
               return;
           }
   
           ob_start();
           extract($args);
   
           $title = ( ! empty( $instance['title'] ) ) ? $instance['title'] : __( 'Recent Posts' );
           $title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
           $number = ( ! empty( $instance['number'] ) ) ? absint( $instance['number'] ) : 10;
           if ( ! $number )
               $number = 10;
           $show_date = isset( $instance['show_date'] ) ? $instance['show_date'] : false;
   
           $r = new WP_Query( apply_filters( 'widget_posts_args', array( 'posts_per_page' => $number, 'no_found_rows' => true, 'post_status' => 'publish', 'ignore_sticky_posts' => true ) ) );
           if ($r->have_posts()) :
   ?>
           <?php echo $before_widget; ?>
           <?php if ( $title ) echo $before_title . $title . $after_title; ?>
           <ul>
           <?php while ( $r->have_posts() ) : $r->the_post(); ?>
               <li>
                   <a href="<?php the_permalink() ?>" title="<?php echo esc_attr( get_the_title() ? get_the_title() : get_the_ID() ); ?>"><?php if ( get_the_title() ) the_title(); else the_ID(); ?></a>
               <?php if ( $show_date ) : ?>
                   <span class="post-date"><?php echo get_the_date(); ?></span>
               <?php endif; ?>
               </li>
           <?php endwhile; ?>
           </ul>
           <?php echo $after_widget; ?>
   <?php
           // Reset the global $the_post as this query will have stomped on it
           wp_reset_postdata();
   
           endif;
   
           $cache[$args['widget_id']] = ob_get_flush();
           wp_cache_set('widget_recent_posts', $cache, 'widget');
       }
   
       function update( $new_instance, $old_instance ) {
           $instance = $old_instance;
           $instance['title'] = strip_tags($new_instance['title']);
           $instance['number'] = (int) $new_instance['number'];
           $instance['show_date'] = (bool) $new_instance['show_date'];
           $this->flush_widget_cache();
   
           $alloptions = wp_cache_get( 'alloptions', 'options' );
           if ( isset($alloptions['widget_recent_entries']) )
               delete_option('widget_recent_entries');
   
           return $instance;
       }
   
       function flush_widget_cache() {
           wp_cache_delete('widget_recent_posts', 'widget');
       }
   
       function form( $instance ) {
           $title     = isset( $instance['title'] ) ? esc_attr( $instance['title'] ) : '';
           $number    = isset( $instance['number'] ) ? absint( $instance['number'] ) : 5;
           $show_date = isset( $instance['show_date'] ) ? (bool) $instance['show_date'] : false;
   ?>
           <p><label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label>
           <input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo $title; ?>" /></p>
   
           <p><label for="<?php echo $this->get_field_id( 'number' ); ?>"><?php _e( 'Number of posts to show:' ); ?></label>
           <input id="<?php echo $this->get_field_id( 'number' ); ?>" name="<?php echo $this->get_field_name( 'number' ); ?>" type="text" value="<?php echo $number; ?>" size="3" /></p>
   
           <p><input class="checkbox" type="checkbox" <?php checked( $show_date ); ?> id="<?php echo $this->get_field_id( 'show_date' ); ?>" name="<?php echo $this->get_field_name( 'show_date' ); ?>" />
           <label for="<?php echo $this->get_field_id( 'show_date' ); ?>"><?php _e( 'Display post date?' ); ?></label></p>
   <?php
       }
   }
   

   If you modify this Widget, be sure to fork it, and register your forked Widget as a new Widget.

   Edit

   How to fork a core Widget

   Start with the Codex entry on the Widgets API.

   1. Rename the Widget

      Change this:

      class WP_Widget_Recent_Posts extends WP_Widget {}
      

      …to this:

      class wpse97411_Widget_Recent_Posts extends WP_Widget {}
      

   2. Modify the Widget class to suit your needs

   3. Register your Widget:

      function wpse97413_register_custom_widgets() {
          register_widget( 'wpse97411_Widget_Recent_Posts' );
      }
      add_action( 'widgets_init', 'wpse97413_register_custom_widgets' );
      

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