Possible Duplicate:
The result of a shortcode appear BEFORE page content
short code output too early

我得到了这个在我的页面上显示我的博客帖子的快捷码，但摘录和评论显示在我的页面顶部。有人知道为什么要这么做吗？

    /// Recent Blog Posts
add_shortcode(\'recent_blog_posts\', \'shortcode_recent_blog_posts\');

    function shortcode_recent_blog_posts($atts) {

            $str = \'\';
            $args = array( \'numberposts\' => 3, \'post_status\'=>"publish",\'post_type\'=>"post",\'orderby\'=>"post_date");
            $postslist = get_posts( $args );

            foreach ($postslist as $post) : setup_postdata($post); 
                $str .= \'<div id ="article-section-box2" class="span3">\';
                                $str .= \'<div id= "image1" class="image-arcticle">\';     
                                $str .= get_the_post_thumbnail($post->ID, \'\');
                                $str .= \'</div>\'; 

                                $str .=\'<p class ="orange16-no-bold">\'.get_the_title($post->ID,\'\').\'</p>\';
                                $str .=\'<p class="date">13 Feb 2012 - <h6 class="orange-title">\'.comments_popup_link(\'0 Comments\', \'1 Comment\', \'% Comments\').\';</h6></p>\';
                                $str .=\'<p class="article_text">\'.the_excerpt("child_of=8d").\'</p>\';
                                $str .=\'</div>\';
            endforeach; 

            return $str;
    }