我有两个表，从左边连接获取数据

Question

post id是两个表中的公共字段。如果我想在同一个post_id下选择评论，那么帖子应该只显示一次，并且所有评论都在其下面。 这是我的代码......

home.php

<?php

$sql="SELECT family_news.post_id,family_news.username,family_news.post,
            family_news.fileToUpload,family_news.description,
            family_comments.post_id,family_comments.comment,
            family_comments.commenter 
     FROM family_news 
        LEFT JOIN family_comments ON family_news.post_id = family_comments.post_id 
     ORDER BY family_news.post_id DESC";

if($result =  mysqli_query($con, $sql))
{
    while($row = mysqli_fetch_array($result))
    {
?>

    <div class="form-group">
    <b style="font-size:30px;color:brown;">

    <?php
        echo $row['username'];
    ?>
    </b>
    <br>
        <?php 
        if($row['fileToUpload'] != NULL)
        {
        ?>
     <form action="post_comment.php" method="POST">
            <input class="form-control" type="hidden" name="post_id" value="<?php echo $row['post_id']; ?>">
           <br>
        <img class="img-responsive" src="../admin_panel/uploads/<?php echo $row['fileToUpload']; ?>" alt="Image Loading" height='80' width='120'>
        <div class="form-group" style="font-size:15px;color:purple;">
            <?php
                echo $row['description'];
            ?>
            <br>
            <h3 style="color:black">Comments</h3>
            <h3 style="color:red">
            <?php
                echo $row['commenter'];
            ?>
            </h3>
            <h4 style="color:saddlebrown">
            <?php
                echo $row['comment'];
            ?>
            </h4>

            <br>
            <input class="form-control" type="text" name="comment" placeholder="Write a comment">
            <br>
            <input class="form-control" type="hidden" name="commenter" value="<?php echo $_SESSION['uname']; ?>">
            <input type="submit" class="btn btn-primary" value="Post"> 

        </div>
    </form>
        <?php 
        }
        if($row['post'] != NULL)
        {
        ?>
        <br>
        <div class="form-group" style="font-size:15px;color:purple;">
            <form action="post_comment.php" method="POST">
            <input class="form-control" type="hidden" name="post_id" value="<?php echo $row['post_id']; ?>">
            <?php
            echo $row['post'];
            ?>
            <br>
            <h3 style="color:black">Comments</h3>
            <h3 style="color:red">
            <?php
                echo $row['commenter'];
            ?>
            </h3>
            <h4 style="color:saddlebrown">
            <?php
                echo $row['comment'];
            ?>
            </h4>
            <br>
            <input class="form-control" type="text" name="comment" placeholder="Write a comment">
            <br>
            <input class="form-control" type="hidden" name="commenter" value="<?php echo $_SESSION['uname']; ?>">
            <input type="submit" class="btn btn-primary" value="Post"> 
            </form>
<?php
        }
?>
</div>
<?php
    }
}

?>
    </div>

</section>

post_comment.php

<section class="col-lg-6 connectedSortable">

<?php
$post_id=$_POST['post_id'];
$comment=$_POST['comment'];
$commenter=$_POST['commenter'];

if($comment != NULL) {
    $sql="INSERT INTO family_comments 
                (post_id, comment, commenter) 
          VALUES ('$post_id', '$comment', '$commenter')";

    if($con ->query($sql) == TRUE)
    {
        echo 'Comment saved Successfully...';
    }
} else {
    echo 'Please Write Something...';
}
?>



</section>