//开启文章缩略图
add_theme_support( ‘post-thumbnails’ );

/*
 * 添加数组到文章列表
 */
add_filter(‘manage_post_posts_columns’, ‘lb_featured_image_column’);
function lb_featured_image_column( $column_array ) {
    $column_array = array_slice( $column_array, 0, 1, true )
    + array(‘featured_image’ => ‘特色图像’)
    + array_slice( $column_array, 1, NULL, true );
 
    return $column_array;
}
 
/*
 * 使用钩子完善数组
 */
add_action(‘manage_posts_custom_column’, ‘lb_render_the_column’, 10, 2);
function lb_render_the_column( $column_name, $post_id ) {
    if( $column_name == ‘featured_image’ ) {
        if( has_post_thumbnail( $post_id ) ) {
            $thumb_id = get_post_thumbnail_id( $post_id );
            echo ‘<img data-id=”‘ . $thumb_id . ‘” src=”https://www.zhankr.net/’ . wp_get_attachment_url( $thumb_id ) . ‘” />’;
        } else {
            echo ‘<img data-id=”-1″ src=”placeholder.png” />’;
        }
    }
}