麻烦附加/组合两个变量

Question

这是我的代码，它是一个论坛，有不喜欢按钮的帖子，如按钮，以及用于评论每个帖子的文本框，请查看下面的屏幕截图。我试图在$ posts结尾处放置$ comments变量（这是评论本身），因此它会显示在帖子下方，就像显示类似按钮和评论框一样。

我试图只是在评论框下面显示评论。如果我在每个循环中调用displayComments（$ comments定义中的函数），那么评论将与帖子分开显示我尝试将$ posts结尾处的$ comments与此运算符组合，并且我＆＃ 39;我们尝试制作一个与它们两者相等的新变量。这是代码（不是完整文件）。

<?php 
include("connect.php"); 
include("check.php");
include("Trying.php");
include("Comment.php");

    if(isset($_POST['username'])){

                if (isset($_POST['post'])) {

                        if ($_FILES['postimg']['size'] == 0) 
                        {
                                $postbody = $_POST['postbody'];
                                $loggedInUserId = check::isLoggedIn();
                                if (strlen($postbody) > 160 || strlen($postbody) < 1) 
                                {
                                    die('Incorrect length!');
                                }

                                connect::query('INSERT INTO dry_posts VALUES (null, :postbody, NOW(),\'\',0,0)', array(':postbody'=>$postbody));


                        } 

                        }


                if (isset($_POST['comment'])) {

                    $postid = $_GET['postid'];
                    $commentbody = $_POST['commentbody'];
                    if (strlen($commentbody) > 160 || strlen($commentbody) < 1) {
                                die('Incorrect length!');
                        }

                            connect::query('INSERT INTO comments VALUES (null,:comment, NOW(), :postid)',array(':comment'=>$commentbody,':postid'=>$postid));
                        //}
                }

                $dbposts = connect::query('SELECT * FROM dry_posts ORDER BY id DESC');
                $posts = "";
                $comments = Comment::displayComments($p['id']);

                foreach($dbposts as $p){
                        if (!connect::query('SELECT post_id FROM dry_likes WHERE post_id=:postid', array(':postid'=>$p['id']))) {
                                $posts .="<img src='".$p['postimg']."'>".htmlspecialchars($p['body'])."
                                <form action='try.php?postid=".$p['id']."' method='post'>
                                        <input type='submit' name='like' value='Like'>
                                        <span>".$p['likes']." likes</span>
                                        <input type='submit' name='dislike' value='Dislike'>
                                        <span>".$p['dislikes']." dislikes</span>
                                </form>
                                <hr /></br />
                                ;
                                <form action='try.php?postid=".$p['id']."' method='post'>
                                <textarea name='commentbody' rows='3' cols='50'></textarea>
                                <input type='submit' name='comment' value='Comment'>
                                </form>
                                <hr /></br />
                                ";
                                //Comment::displayComments($p['id']);

                } 
                        else{
                                $posts .="<img src='".$p['postimg']."'>".htmlspecialchars($p['body'])."
                                <form action='try.php?postid=".$p['id']."' method='post'>
                                        <input type='submit' name='like' value='Like'>
                                        <span>".$p['likes']." likes</span>
                                        <input type='submit' name='dislike' value='Dislike'>
                                        <span>".$p['dislikes']." dislikes</span>
                                </form>
                                <hr /></br />
                                <form action='try.php?postid=".$p['id']."' method='post'>
                                <textarea name='commentbody' rows='3' cols='50'></textarea>
                                <input type='submit' name='comment' value='Comment'>
                                </form>
                                <hr /></br />
                                ";
                                //Comment::displayComments($p['id']);

                        } 

                }

?>

<form action='try.php' class = "forum" method="post" enctype="multipart/form-data">
        <textarea name="postbody" rows="4" cols="60" class = "text"></textarea>
         <br />Upload an image:
        <input type="file" name="postimg">
        <input type="submit" name="post" value="Post">
</form>

<div class="posts">
        <?php echo $posts;

        ?>
</div>

这是我在$ comments变量中调用的函数

public static function displayComments($postid)
        {

            $comments = connect::query('SELECT * FROM comments WHERE post_id=:postid',array(':postid'=>$postid));
            foreach($comments as $comment)
            {
                 echo $comment['comment']."<hr />";
            }
        }

我知道这对很多人没有帮助，但我不知道该怎么做，你怎么建议我把所有内容都显示为内联，重新安排我的代码？