I'm using a modified version of the Recent Posts plugin together with WP Total Cache. I'm using post__not_in as I don't want to display the current post again. It works well, but if Object Cache is activated, on some posts post__not_in does not work.
Here is my code:
<?php function nothing_recent_posts_init() {
register_widget('nothing_recent_posts');
}
add_action('widgets_init', 'nothing_recent_posts_init');
class nothing_recent_posts extends WP_Widget {
function __construct() {
$widget_ops = array('classname' => 'nothing_recent_posts', 'description' => __( "Customized version of Recent Posts. You can choose what to display and add custom classes.") );
parent::__construct('nothing-recent-posts', __('Customized Recent Posts'), $widget_ops);
$this->alt_option_name = 'nothing_recent_entries';
add_action( 'save_post', array($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) {
$cache = wp_cache_get('nothing_recent_posts', 'widget');
if ( !is_array($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_title = isset( $instance['show_title'] ) ? $instance['show_title'] : false;
$show_date = isset( $instance['show_date'] ) ? $instance['show_date'] : false;
$show_img = isset( $instance['show_img'] ) ? $instance['show_img'] : false;
$custom_class = ( ! empty( $instance['custom_class'] ) ) ? $instance['custom_class'] : ' ';
$query_by_cat = isset( $instance['query_by_cat'] ) ? $instance['query_by_cat'] : false;
if( $query_by_cat ){
$current_category = wp_get_post_categories( get_the_id() );
$r = new WP_Query( apply_filters( 'widget_posts_args', array(
'category__in' => $current_category,
'posts_per_page' => $number,
'no_found_rows' => true,
'post_status' => 'publish',
'ignore_sticky_posts' => true,
'post__not_in' => array(get_the_id())
) ) );
}else{
$r = new WP_Query( apply_filters( 'widget_posts_args', array(
'posts_per_page' => $number,
'no_found_rows' => true,
'post_status' => 'publish',
'ignore_sticky_posts' => true,
'post__not_in' => array(get_the_id())
) ) );
}
if ($r->have_posts()) : ?>
<?php echo $before_widget; ?>
<?php if ( $title ) echo $before_title . $title . $after_title; ?>
<?php while ( $r->have_posts() ) : $r->the_post(); ?>
<article class="hentry <?php echo $custom_class; ?>">
<a href="<?php the_permalink(); ?>" rel="bookmark" title='Den Beitrag "<?php the_title(); ?>" ansehen'>
<?php if ( $show_img ) : ?>
<div class="entry-thumbnail">
<?php the_post_thumbnail( 'thumbnail' ); ?>
</div><!-- .entry-thumbnail -->
<?php endif; ?>
<?php if ( $show_title ) : ?>
<header class="widget-entry-header">
<div class="inner">
<h2><?php the_title(); ?></h2>
</div>
</header><!-- .entry-header -->
<?php endif; ?>
<?php if ( $show_date ) : ?>
<span class="post-date"><?php echo get_the_date(); ?></span>
<?php endif; ?>
</a>
</article>
<?php endwhile; ?>
<?php echo $after_widget; ?>
<?php wp_reset_postdata();
endif;
$cache[$args['widget_id']] = ob_get_flush();
wp_cache_set('nothing_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'] = isset( $new_instance['show_date'] ) ? (bool) $new_instance['show_date'] : false;
$instance['show_title'] = isset( $new_instance['show_title'] ) ? (bool) $new_instance['show_title'] : false;
$instance['show_img'] = isset( $new_instance['show_img'] ) ? (bool) $new_instance['show_img'] : false;
$instance['custom_class'] = strip_tags($new_instance['custom_class']);
$instance['query_by_cat'] = isset( $new_instance['query_by_cat'] ) ? (bool) $new_instance['query_by_cat'] : false;
$this->flush_widget_cache();
$alloptions = wp_cache_get( 'alloptions', 'options' );
if ( isset($alloptions['nothing_recent_entries']) )
delete_option('nothing_recent_entries');
return $instance;
}
function flush_widget_cache() {
wp_cache_delete('nothing_recent_posts', 'widget');
}
function form( $instance ) {
$title = isset( $instance['title'] ) ? esc_attr( $instance['title'] ) : '';
$number = isset( $instance['number'] ) ? absint( $instance['number'] ) : 5;
$show_title = isset( $instance['show_title'] ) ? (bool) $instance['show_title'] : true;
$show_date = isset( $instance['show_date'] ) ? (bool) $instance['show_date'] : false;
$show_img = isset( $instance['show_img'] ) ? (bool) $instance['show_img'] : false;
$custom_class = isset( $instance['custom_class'] ) ? esc_attr( $instance['custom_class'] ) : '';
$query_by_cat = isset( $instance['query_by_cat'] ) ? (bool) $instance['query_by_cat'] : 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_title ); ?> id="<?php echo $this->get_field_id( 'show_title' ); ?>" name="<?php echo $this->get_field_name( 'show_title' ); ?>" />
<label for="<?php echo $this->get_field_id( 'show_title' ); ?>"><?php _e( 'Display post title?' ); ?></label></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>
<p><input class="checkbox" type="checkbox" <?php checked( $show_img ); ?> id="<?php echo $this->get_field_id( 'show_img' ); ?>" name="<?php echo $this->get_field_name( 'show_img' ); ?>" />
<label for="<?php echo $this->get_field_id( 'show_img' ); ?>"><?php _e( 'Display post image?' ); ?></label></p>
<p><label for="<?php echo $this->get_field_id( 'custom_class' ); ?>"><?php _e( 'Custom class:' ); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id( 'custom_class' ); ?>" name="<?php echo $this->get_field_name( 'custom_class' ); ?>" type="text" value="<?php echo $custom_class; ?>" /></p>
<p><input class="checkbox" type="checkbox" <?php checked( $query_by_cat ); ?> id="<?php echo $this->get_field_id( 'query_by_cat' ); ?>" name="<?php echo $this->get_field_name( 'query_by_cat' ); ?>" />
<label for="<?php echo $this->get_field_id( 'query_by_cat' ); ?>"><?php _e( 'Filter by current category?' ); ?></label></p>
<?php
}
}
