WP Widget: 带分类过滤功能的最新文章 小工具

//////// 带过滤功能的最新文章
//Adds zww_recent_posts_widget widget.
class zww_recent_posts_widget extends WP_Widget {
    //Register widget with WordPress.
    public function __construct() {
        parent::__construct(
             ‘zww_recent_posts_widget‘, // Base ID
            ‘ZWW\‘s 最新文章‘, // Name
            array( ‘description‘ => ‘带分类过滤功能的最新文章‘, ) // Args
        );
    }
    public function widget( $args, $instance ) {
        extract( $args );
        $title = apply_filters( ‘widget_title‘, $instance[‘title‘] );
        $post_num = apply_filters( ‘widget_title‘, $instance[‘post_num‘] );
        $catID = apply_filters( ‘widget_title‘, $instance[‘catID‘] );

        echo $before_widget;

        if ( ! empty( $title ) )
            echo $before_title . $title . $after_title; ?>

        <ul>
            <?php
            global $post;
            $tmp_post = $post;
            $recent_posts = get_posts(‘orderby=ASC&numberposts=‘.$post_num.‘&category=‘.$catID);
            foreach( $recent_posts as $post ) { setup_postdata($post); ?>
                <li><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li>
            <?php } $post = $tmp_post; setup_postdata($post); ?>
        </ul>

        <?php
        echo $after_widget;
    }

    public function update( $new_instance, $old_instance ) {
        $instance = array();
        $instance[‘title‘] = strip_tags( $new_instance[‘title‘] );
        $instance[‘post_num‘] = strip_tags( $new_instance[‘post_num‘] );
        $instance[‘catID‘] = strip_tags( $new_instance[‘catID‘] );
        return $instance;
    }

    public function form( $instance ) {
        if ( isset( $instance[ ‘title‘ ] ) ) {
            $title = $instance[ ‘title‘ ];
        }
        else {
            $title = ‘Recent Posts‘;
        }
        if ( isset( $instance[ ‘post_num‘ ] ) ) {
            $post_num = $instance[ ‘post_num‘ ];
        }
        else {
            $post_num = 5;
        }
        if ( isset( $instance[ ‘catID‘ ] ) ) {
            $catID = $instance[ ‘catID‘ ];
        }
        else {
            $catID = ‘‘;
        }
        ?>
        <p>
            <label for="<?php echo $this->get_field_id( ‘title‘ ); ?>">标题:</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 esc_attr( $title ); ?>" />
            <label for="<?php echo $this->get_field_id( ‘post_num‘ ); ?>">显示数量:</label> 
            <input class="widefat" id="<?php echo $this->get_field_id( ‘post_num‘ ); ?>" name="<?php echo $this->get_field_name( ‘post_num‘ ); ?>" type="text" value="<?php echo esc_attr( $post_num ); ?>" />
            <label for="<?php echo $this->get_field_id( ‘slug‘ ); ?>">选择分类:</label> 
            <?php
            wp_dropdown_categories(array(
                ‘name‘ => $this->get_field_name( ‘catID‘ ),
                ‘hide_empty‘ => 0,
                ‘orderby‘ => ‘name‘,
                ‘show_count‘ => 1,
                ‘selected‘ => esc_attr( $catID ),
                ‘hierarchical‘ => true,
                ‘show_option_none‘ =>‘全部分类‘,
                ‘echo‘ => 1
                ));
                ?>
        </p>
        <?php 
    }
} // class zww_recent_posts_widget
// register zww_recent_posts_widget widget
add_action( ‘widgets_init‘, create_function( ‘‘, ‘register_widget( "zww_recent_posts_widget" );‘ ) );