如何给WordPress后台文章列表，添加缩略图

WordPress 2.9版引入文章缩略图的功能，这个特色图像功能，不仅可以在前台显示，后台文章列表中也可以显示缩略图。

WordPress 2.9版引入文章缩略图的功能，这个特色图像功能，不仅可以在前台显示，后台文章列表中也可以显示缩略图。

将如下代码添加到当前主题functions.php中：

if ( !function_exists(\'fb_AddThumbColumn\') && function_exists(\'add_theme_support\') ) {
    // for post and page
    add_theme_support(\'post-thumbnails\', array( \'post\', \'page\' ) );
    function fb_AddThumbColumn($cols) {
        $cols[\'thumbnail\'] = __(\'Thumbnail\');
        return $cols;
    }
    function fb_AddThumbValue($column_name, $post_id) {
            $width = (int) 35;
            $height = (int) 35;
            if ( \'thumbnail\' == $column_name ) {
                // thumbnail of WP 2.9
                $thumbnail_id = get_post_meta( $post_id, \'_thumbnail_id\', true );
                // image from gallery
                $attachments = get_children( array(\'post_parent\' => $post_id, \'post_type\' => \'attachment\', \'post_mime_type\' => \'image\') );
                if ($thumbnail_id)
                    $thumb = wp_get_attachment_image( $thumbnail_id, array($width, $height), true );
                elseif ($attachments) {
                    foreach ( $attachments as $attachment_id => $attachment ) {
                        $thumb = wp_get_attachment_image( $attachment_id, array($width, $height), true );
                    }
                }
                    if ( isset($thumb) && $thumb ) {
                        echo $thumb;
                    } else {
                        echo __(\'None\');
                    }
            }
    }
    // for posts
    add_filter( \'manage_posts_columns\', \'fb_AddThumbColumn\' );
    add_action( \'manage_posts_custom_column\', \'fb_AddThumbValue\', 10, 2 );
    // for pages
    add_filter( \'manage_pages_columns\', \'fb_AddThumbColumn\' );
    add_action( \'manage_pages_custom_column\', \'fb_AddThumbValue\', 10, 2 );
}

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